149-522: Clan Armstrong is a Scottish clan of the Scottish Borders . According to the legend and tradition, the first of the name Armstrong was Siward Beorn ( sword warrior ), who was also known as Siward Digry ( sword strong arm ). He was said to be the last Anglo - Danish Earl of Northumberland and a nephew of King Canute , the Danish king of England who reigned until 1035. The Armstrong name
298-556: A "clan" in legislation of the Scottish Parliament in 1384. Many clans have often claimed mythological founders that reinforced their status and gave a romantic and glorified notion of their origins. Most powerful clans gave themselves origins based on Irish mythology . For example, there have been claims that the Clan Donald were descended from either Conn , a second-century king of Ulster , or Cuchulainn ,
447-400: A clan is the only person who is entitled to bear the undifferenced arms of the ancestral founder of the clan. The clan is considered to be the chief's heritable estate and the chief's Seal of Arms is the seal of the clan as a "noble corporation". Under Scots law, the chief is recognised as the head of the clan and serves as the lawful representative of the clan community. Historically, a clan
596-494: A clan. As noted above, the word clan is derived from the Gaelic word clann . However, the need for proved descent from a common ancestor related to the chiefly house is too restrictive. Clans developed a territory based on the native men who came to accept the authority of the dominant group in the vicinity. A clan also included a large group of loosely related septs – dependent families – all of whom looked to
745-465: A commercial landlord, letting land to the highest bidder, was a clear breach of the principle of dùthchas . The Jacobite rising of 1745 used to be described as the pivotal event in the demise in clanship. There is no doubt that the aftermath of the uprising saw savage punitive expeditions against clans that had supported the Jacobites, and legislative attempts to demolish clan culture. However,
894-425: A decisive role on local surface temperatures . Parts of many craters, particularly the bottoms of many polar craters, are permanently shadowed, these " craters of eternal darkness " have extremely low temperatures. The Lunar Reconnaissance Orbiter measured the lowest summer temperatures in craters at the southern pole at 35 K (−238 °C; −397 °F) and just 26 K (−247 °C; −413 °F) close to
1043-550: A descendant through the maternal line has changed their surname in order to claim the chiefship of a clan, such as the late chief of the Clan MacLeod who was born John Wolridge-Gordon and changed his name to the maiden name of his maternal grandmother in order to claim the chiefship of the MacLeods. Today, clans may have lists of septs . Septs are surnames, families or clans that historically, currently or for whatever reason
1192-434: A few kilometers wide), shallower, and more irregularly shaped than impact craters. They also lack the upturned rims characteristic of impact craters. Several geologic provinces containing shield volcanoes and volcanic domes are found within the near side maria. There are also some regions of pyroclastic deposits , scoria cones and non-basaltic domes made of particularly high viscosity lava. Almost all maria are on
1341-417: A forgery, but despite this, the designs are still highly regarded and they continue to serve their purpose to identify the clan in question. A sign of allegiance to the clan chief is the wearing of a crest badge. The crest badge suitable for a clansman or clanswoman consists of the chief's heraldic crest encircled with a strap and buckle and which contains the chief's heraldic motto or slogan . Although it
1490-503: A global dipolar magnetic field and only has crustal magnetization likely acquired early in its history when a dynamo was still operating. Early in its history, 4 billion years ago, its magnetic field strength was likely close to that of Earth today. This early dynamo field apparently expired by about one billion years ago, after the lunar core had crystallized. Theoretically, some of the remnant magnetization may originate from transient magnetic fields generated during large impacts through
1639-718: A hospitable environment for future astronauts, protecting them from extreme temperatures, solar radiation, and micrometeorites. However, challenges include accessibility and risks of avalanches and cave-ins. This discovery offers potential for future lunar bases or emergency shelters. The main features visible from Earth by the naked eye are dark and relatively featureless lunar plains called maria (singular mare ; Latin for "seas", as they were once believed to be filled with water) are vast solidified pools of ancient basaltic lava. Although similar to terrestrial basalts, lunar basalts have more iron and no minerals altered by water. The majority of these lava deposits erupted or flowed into
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#17327824052851788-533: A landscape featuring craters of all ages. The Moon was volcanically active until 1.2 billion years ago, which laid down the prominent lunar maria . Most of the mare basalts erupted during the Imbrian period , 3.3–3.7 billion years ago, though some are as young as 1.2 billion years and some as old as 4.2 billion years. There are differing explanations for the eruption of mare basalts, particularly their uneven occurrence which mainly appear on
1937-822: A legally recognised group, but does not differentiate between families and clans as it recognises both terms as being interchangeable. Clans or families thought to have had a chief in the past but not currently recognised by the Lord Lyon are listed at armigerous clans . Tartans were traditionally associated with the Highland Clans and following the end of the Dress Act of 1746 banning tartans from being worn by men and boys, "district then clan tartans" have been an important part of Scottish clans. Almost all Scottish clans have more than one tartan attributed to their surname. Although there are no rules on who can or cannot wear
2086-476: A particular tartan, and it is possible for anyone to create a tartan and name it almost any name they wish, the only person with the authority to make a clan's tartan "official" is the chief. In some cases, following such recognition from the clan chief, the clan tartan is recorded and registered by the Lord Lyon. Once approved by the Lord Lyon, after recommendation by the Advisory Committee on Tartan,
2235-406: A pole and used as a standard . Clans which are connected historically, or that occupied lands in the same general area, may share the same clan badge. According to popular lore, clan badges were used by Scottish clans as a form of identification in battle. However, the badges attributed to clans today can be completely unsuitable for even modern clan gatherings. Clan badges are commonly referred to as
2384-479: A radius of about 500 kilometres (310 mi). This structure is thought to have developed through the fractional crystallization of a global magma ocean shortly after the Moon's formation 4.5 billion years ago. Crystallization of this magma ocean would have created a mafic mantle from the precipitation and sinking of the minerals olivine , clinopyroxene , and orthopyroxene ; after about three-quarters of
2533-604: A range of measures on clan chiefs, designed to integrate them into the Scottish landed classes. Whilst there is debate over their practical effect, they were an influential force on clan elites in the long term. The Statutes obliged clan chiefs to reside in Edinburgh for a large part of the year, and have their heirs educated in the English-speaking Lowlands. Lengthy periods in Edinburgh were costly. Since
2682-493: A rare component of society. Historian T. M. Devine describes "the displacement of this class as one of the clearest demonstrations of the death of the old Gaelic society." Many tacksmen, as well as the wealthier farmers (who were tired of repeated rent increases) chose to emigrate. This could be taken as resistance to the changes in the Highland agricultural economy, as the introduction of agricultural improvement gave rise to
2831-458: A satellite with similar mass and iron content to the Moon into orbit far outside Earth's Roche limit . Even satellites that initially pass within the Roche limit can reliably and predictably survive, by being partially stripped and then torqued onto wider, stable orbits. On November 1, 2023, scientists reported that, according to computer simulations, remnants of Theia could still be present inside
2980-487: A short step for that community to become identified by it. Many clans have their own clan chief ; those that do not are known as armigerous clans . Clans generally identify with geographical areas originally controlled by their founders, sometimes with an ancestral castle and clan gatherings, which form a regular part of the social scene. The most notable clan event of recent times was The Gathering 2009 in Edinburgh, which attracted at least 47,000 participants from around
3129-475: A study of Ina , a tiny depression in Lacus Felicitatis , found jagged, relatively dust-free features that, because of the lack of erosion by infalling debris, appeared to be only 2 million years old. Moonquakes and releases of gas indicate continued lunar activity. Evidence of recent lunar volcanism has been identified at 70 irregular mare patches , some less than 50 million years old. This raises
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#17327824052853278-502: A texture resembling snow and a scent resembling spent gunpowder . The regolith of older surfaces is generally thicker than for younger surfaces: it varies in thickness from 10–15 m (33–49 ft) in the highlands and 4–5 m (13–16 ft) in the maria. Beneath the finely comminuted regolith layer is the megaregolith , a layer of highly fractured bedrock many kilometers thick. These extreme conditions are considered to make it unlikely for spacecraft to harbor bacterial spores at
3427-400: A total solar eclipse . From Earth about 59% of the lunar surface is visible over time due to cyclical shifts in perspective ( libration ), making parts of the far side of the Moon visible. The Moon has been an important source of inspiration and knowledge for humans, having been crucial to cosmography , mythology, religion , art, time keeping , natural science , and spaceflight . In 1959,
3576-439: A trans-Atlantic flight, 200 times more than on Earth's surface. For further comparison radiation on a flight to Mars is about 1.84 millisieverts per day and on Mars on average 0.64 millisieverts per day, with some locations on Mars possibly having levels as low as 0.342 millisieverts per day. The Moon's axial tilt with respect to the ecliptic is only 1.5427°, much less than the 23.44° of Earth. Because of this small tilt,
3725-587: Is a kinship group among the Scottish people . Clans give a sense of shared heritage and descent to members, and in modern times have an official structure recognised by the Court of the Lord Lyon , which regulates Scottish heraldry and coats of arms . Most clans have their own tartan patterns, usually dating from the 19th century, which members may incorporate into kilts or other clothing. The modern image of clans, each with their own tartan and specific land,
3874-629: Is also a descendant. Although there has been no trace of the Armstrong chiefs since the clan was dispersed in the 17th century, there is a powerful and active clan association and the Clan Armstrong Trust was established in 1978. Castles owned by the Clan Armstrong have included amongst many others: It is unknown if any of the early Armstrongs spoke Gaelic , but Gaelic-derived place names such as Auchenrivock can be found in
4023-489: Is around 3 × 10 atm (0.3 nPa ); it varies with the lunar day. Its sources include outgassing and sputtering , a product of the bombardment of lunar soil by solar wind ions. Elements that have been detected include sodium and potassium , produced by sputtering (also found in the atmospheres of Mercury and Io ); helium-4 and neon from the solar wind; and argon-40 , radon-222 , and polonium-210 , outgassed after their creation by radioactive decay within
4172-581: Is asymmetric, being more dense near the boundary between the Moon's dayside and nightside. Ionizing radiation from cosmic rays , the Sun and the resulting neutron radiation produce radiation levels on average of 1.369 millisieverts per day during lunar daytime , which is about 2.6 times more than on the International Space Station with 0.53 millisieverts per day at about 400 km above Earth in orbit, 5–10 times more than during
4321-406: Is common to speak of "clan crests", there is no such thing. In Scotland (and indeed all of UK) only individuals, not clans, possess a heraldic coat of arms . Even though any clansmen and clanswomen may purchase crest badges and wear them to show their allegiance to his or her clan, the heraldic crest and motto always belong to the chief alone. In principle, these badges should only be used with
4470-401: Is covered in lunar dust and marked by mountains , impact craters , their ejecta , ray-like streaks , rilles and, mostly on the near side of the Moon, by dark maria ("seas"), which are plains of cooled lava . These maria were formed when molten lava flowed into ancient impact basins. The Moon is, except when passing through Earth's shadow during a lunar eclipse , always illuminated by
4619-561: Is estimated from about 500 km (300 miles) to 1,737 km (1,079 miles). While the giant-impact theory explains many lines of evidence, some questions are still unresolved, most of which involve the Moon's composition. Models that have the Moon acquiring a significant amount of the proto-earth are more difficult to reconcile with geochemical data for the isotopes of zirconium, oxygen, silicon, and other elements. A study published in 2022, using high-resolution simulations (up to 10 particles), found that giant impacts can immediately place
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4768-440: Is on average about 1.9 km (1.2 mi) higher than that of the near side. The discovery of fault scarp cliffs suggest that the Moon has shrunk by about 90 metres (300 ft) within the past billion years. Similar shrinkage features exist on Mercury . Mare Frigoris, a basin near the north pole long assumed to be geologically dead, has cracked and shifted. Since the Moon does not have tectonic plates, its tectonic activity
4917-477: Is simply Moon , with a capital M. The noun moon is derived from Old English mōna , which (like all its Germanic cognates) stems from Proto-Germanic *mēnōn , which in turn comes from Proto-Indo-European *mēnsis 'month' (from earlier *mēnōt , genitive *mēneses ) which may be related to the verb 'measure' (of time). Occasionally, the name Luna / ˈ l uː n ə / is used in scientific writing and especially in science fiction to distinguish
5066-574: Is slow and cracks develop as it loses heat. Scientists have confirmed the presence of a cave on the Moon near the Sea of Tranquillity , not far from the 1969 Apollo 11 landing site. The cave, identified as an entry point to a collapsed lava tube, is roughly 45 meters wide and up to 80 m long. This discovery marks the first confirmed entry point to a lunar cave. The analysis was based on photos taken in 2010 by NASA's Lunar Reconnaissance Orbiter . The cave's stable temperature of around 17 °C could provide
5215-476: Is the lowest point on the surface of the Moon. The highest elevations of the Moon's surface are located directly to the northeast, which might have been thickened by the oblique formation impact of the South Pole–Aitken basin. Other large impact basins such as Imbrium , Serenitatis , Crisium , Smythii , and Orientale possess regionally low elevations and elevated rims. The far side of the lunar surface
5364-767: Is therefore quite correct to talk of the MacDonald family or the Stirling clan ." The idea that Highlanders should be listed as clans while the Lowlanders should be termed as families was merely a 19th-century convention. Although Gaelic has been supplanted by English in the Scottish Lowlands for nearly six hundred years, it is acceptable to refer to Lowland families, such as the Douglases as "clans". The Lowland Clan MacDuff are described specifically as
5513-844: The Anglo-Scottish Wars of the Borders. In 1610 the last of the Armstrong lairds was hanged in Edinburgh for leading a raid on Penrith , England. This was followed by a ruthless campaign by the Crown to pacify the Borders. As a result, families were scattered with many of them seeking new homes in Ulster , particularly in County Fermanagh . Armstrong is now amongst the fifty most common names in Ulster. There has been no trace of
5662-580: The Clan Mackenzie were prepared to play off territorial disputes within and among clans to expand their own land and influence. Feuding on the western seaboard was conducted with such intensity that the Clan MacLeod and the Clan MacDonald on the Isle of Skye were reputedly reduced to eating dogs and cats in the 1590s. Feuding was further compounded by the involvement of Scottish clans in
5811-646: The Clan Sweeney , Clan Lamont , Clan MacLea , Clan MacLachlan and Clan MacNeill , can trace their ancestry back to the fifth century Niall of the Nine Hostages , High King of Ireland. However, in reality, the progenitors of clans can rarely be authenticated further back than the 11th century, and a continuity of lineage in most cases cannot be found until the 13th or 14th centuries. The emergence of clans had more to do with political turmoil than ethnicity. The Scottish Crown's conquest of Argyll and
5960-503: The Heritable Jurisdictions Act which extinguished the right of chiefs to hold courts and transferred this role to the judiciary. The traditional loyalties of clansmen were probably unaffected by this. There is also doubt about any real effect from the banning of Highland dress (which was repealed in 1782 anyway). The Highland Clearances saw further actions by clan chiefs to raise more money from their lands. In
6109-600: The Highland clearances . The loss of this middle tier of Highland society represented not only a flight of capital from Gaeldom, but also a loss of entrepreneurial energy. The first major step in the clearances was the decision of the Dukes of Argyll to put tacks (or leases) of farms and townships up for auction. This began with Campbell property in Kintyre in the 1710s and spread after 1737 to all their holdings. This action as
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6258-675: The Jacobite risings was the result of their remoteness, and the feudal clan system which required tenants to provide military service. Historian Frank McLynn identifies seven primary drivers in Jacobitism, support for the Stuarts being the least important; a large percentage of Jacobite support in 1745 Rising came from Lowlanders who opposed the 1707 Union , and members of the Scottish Episcopal Church . In 1745,
6407-464: The Middle Ages ; however, by the early modern period the concept of oighreachd was favoured. This shift reflected the importance of Scots law in shaping the structure of clanship in that the fine were awarded charters and the continuity of heritable succession was secured. The heir to the chief was known as the tainistear and was usually the direct male heir. However, in some cases
6556-615: The Outer Hebrides from the Norsemen in the 13th century, which followed on from the pacification of the Mormaer of Moray and the northern rebellions of the 12th and 13th centuries, created the opportunity for war lords to impose their dominance over local families who accepted their protection. These warrior chiefs can largely be categorized as Celtic ; however, their origins range from Gaelic to Norse-Gaelic and British . By
6705-590: The Ulster Gaelic name, Mac Tréan-Labhraidh, a branch of the Ó Labhradha family. Tréan-Labhradh means strong-speaking but it is thought that the name was misunderstood as meaning strong-arm , and Armstrong was adopted as a convenient Anglicization . Mac Tréan-Labhraidh would translate as Mac Treun-Labhraidh in Scottish Gaelic. Other common associated names include variations on Traynor , Treanor, Trainor, McCreanor, MacCrainor; which all derive from
6854-482: The clan chief as their head and their protector. According to the former Lord Lyon, Sir Thomas Innes of Learney , a clan is a community that is distinguished by heraldry and recognised by the Sovereign . Learney considered clans to be a "noble incorporation" because the arms borne by a clan chief are granted or otherwise recognised by the Lord Lyon as an officer of the Crown, thus conferring royal recognition to
7003-792: The tribalism that was found in Ancient Europe or the one that is still found in the Middle East and among aboriginal groups in Australasia, Africa, and the Americas. During the 1638 to 1651 Wars of the Three Kingdoms , all sides were 'Royalist', in the sense of a shared belief monarchy was divinely inspired. The choice of whether to support Charles I, or the Covenanter government, was largely driven by disputes within
7152-593: The 14th century, there had been further influx of kindreds whose ethnicity ranged from Norman or Anglo-Norman and Flemish , such as the Clan Cameron , Clan Fraser , Clan Menzies , Clan Chisholm and Clan Grant . During the Wars of Scottish Independence , feudal tenures were introduced by Robert the Bruce , to harness and control the prowess of clans by the award of charters for land in order to gain support in
7301-577: The 17th century, this had declined and most reiving was known as sprèidh , where smaller numbers of men raided the adjoining Lowlands and the livestock taken usually being recoverable on payment of tascal (information money) and guarantee of no prosecution. Some clans, such as the Clan MacFarlane and the Clan Farquharson , offered the Lowlanders protection against such raids, on terms not dissimilar to blackmail . An act of
7450-401: The 18th century, in an effort to increase the income from their estates, clan chiefs started to restrict the ability of tacksmen to sublet. This meant more of the rent paid by those actually farming the land went to the landowner. The result, though, was the removal of this layer of clan society. In a process that accelerated from the 1770s onward, by the early 19th century the tacksman had become
7599-623: The Armstrong chiefs since the clan was dispersed in the 17th century. Curiously, despite their tense relationship with the Stewart crown, a number of Armstrongs are recorded as officers in the royalist armies serving Charles I in the Wars of the Three Kingdoms. "Robert Armstrong, Gent, one of His Maties Servants," was buried at St. Olave, York," among a number of royalist casualties. The professional soldier Sir Thomas Armstrong settled in Ireland in 1639,
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#17327824052857748-641: The Armstrongs was seen by James V of Scotland as a threat to his own authority. According to tradition, James tricked John Armstrong of Gilnockie to a meeting at Hawick where the king hanged the Armstrong laird without further ado. King James continued his treatment of the Armstrongs when they failed to support him in 1542 at the Battle of Solway Moss . In 1603 the Union of the Crowns brought an official end to
7897-600: The Church of Scotland. This was supported by many chiefs since it suited the hierarchical clan structure and encouraged obedience to authority. Both Charles and his brother James VII used Highland levies, known as the "Highland Host", to control Campbell-dominated areas in the South-West and suppress the 1685 Argyll's Rising . By 1680, it is estimated there were fewer than 16,000 Catholics in Scotland , confined to parts of
8046-504: The Earth and the material accreted and formed the Moon just beyond the Earth's Roche limit of ~ 2.56 R 🜨 . Giant impacts are thought to have been common in the early Solar System. Computer simulations of giant impacts have produced results that are consistent with the mass of the lunar core and the angular momentum of the Earth–Moon system. These simulations show that most of
8195-520: The Earth's moon from others, while in poetry "Luna" has been used to denote personification of the Moon. Cynthia / ˈ s ɪ n θ i ə / is another poetic name, though rare, for the Moon personified as a goddess, while Selene / s ə ˈ l iː n iː / (literally 'Moon') is the Greek goddess of the Moon. The English adjective pertaining to the Moon is lunar , derived from the Latin word for
8344-581: The Earth, and its diameter is 3,474 km (2,159 mi), roughly one-quarter of Earth's (about as wide as the United States from coast to coast ). Within the Solar System , it is the largest and most massive satellite in relation to its parent planet , the fifth largest and most massive moon overall, and larger and more massive than all known dwarf planets . Its surface gravity is about one sixth of Earth's, about half of that of Mars , and
8493-429: The Earth, due to gravitational anomalies from impact basins. Its shape is more elongated than current tidal forces can account for. This 'fossil bulge' indicates that the Moon solidified when it orbited at half its current distance to the Earth, and that it is now too cold for its shape to restore hydrostatic equilibrium at its current orbital distance. The Moon is by size and mass the fifth largest natural satellite of
8642-469: The Earth-Moon system might be explained by the post-impact mixing of the vaporized material that formed the two, although this is debated. The impact would have released enough energy to liquefy both the ejecta and the Earth's crust, forming a magma ocean. The liquefied ejecta could have then re-accreted into the Earth–Moon system. The newly formed Moon would have had its own magma ocean ; its depth
8791-530: The Earth. The newly formed Moon settled into a much closer Earth orbit than it has today. Each body therefore appeared much larger in the sky of the other, eclipses were more frequent, and tidal effects were stronger. Due to tidal acceleration , the Moon's orbit around Earth has become significantly larger, with a longer period. Following formation, the Moon has cooled and most of its atmosphere has been stripped. The lunar surface has since been shaped by large impact events and many small ones, forming
8940-792: The Esk River valley, and the language persisted in Galloway , Carrick and the Western Borders well into the seventeenth century, so it is possible. The name of the Armstrong stronghold itself, Gilnockie, is from the Scottish Gaelic Geal Cnocan meaning 'Little White Hill'. The Armstrong name is sometimes rendered in Gaelic as follows: These Gaelic names appear frequently in modern clan literature, but they are neologistic and are rarely used by Gaelic speakers. However, Armstrong has been historically associated with
9089-495: The Highlands were a largely non-cash economy, this meant they shifted towards commercial exploitation of their lands, rather than managing them as part of a social system. The costs of living away from their clan lands contributed to the chronic indebtedness that was increasingly common for Highland landowners, eventually leading to the sale of many of the great Highland estates in the late 18th and early 19th century. During
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#17327824052859238-532: The Highlands, others also show Lowland clans or families. Territorial areas and allegiances changed over time, and there are also differing decisions on which (smaller) clans and families should be omitted (some alternative online sources are listed in the External links section below). This list of clans contains clans registered with the Lord Lyon Court . The Lord Lyon Court defines a clan or family as
9387-656: The Irish Gaelic name, Mac Threinfhir, meaning son of the strong man . After the Plantation of Ulster many Armstrongs (mainly those who were Catholic) adopted the Traynor surname. Among the best-known Gaelic-speaking Armstrongs was Dr Robert Armstrong of Perthshire , who compiled an authoritative early Gaelic-English dictionary, published in 1825. Scottish clan A Scottish clan (from Scottish Gaelic clann , literally 'children', more broadly 'kindred' )
9536-585: The Lord Advocate (Attorney General) writing in 1680, said: "By the term 'chief' we call the representative of the family from the word chef or head and in the Irish [Gaelic] with us the chief of the family is called the head of the clan". In summarizing this material, Sir Crispin Agnew of Lochnaw Bt wrote: "So it can be seen that all along the words chief or head and clan or family are interchangeable. It
9685-438: The Lowlands increased. This gave an advantage in speaking English, as the "language of work". It was found that when the Gaelic Schools Society started teaching basic literacy in Gaelic in the early decades of the 19th century, there was an increase in literacy in English. This paradox may be explained by the annual report of the Society in Scotland for Propagating Christian Knowledge (SSPCK) in 1829, which stated: "so ignorant are
9834-450: The Moon approximately 10 minutes, taking 5 minutes to rise, and 5 minutes to fall. On average, 120 kilograms of dust are present above the Moon, rising up to 100 kilometers above the surface. Dust counts made by LADEE 's Lunar Dust EXperiment (LDEX) found particle counts peaked during the Geminid , Quadrantid , Northern Taurid , and Omicron Centaurid meteor showers , when the Earth, and Moon pass through comet debris. The lunar dust cloud
9983-458: The Moon derived from the impactor, rather than the proto-Earth. However, models from 2007 and later suggest a larger fraction of the Moon derived from the proto-Earth. Other bodies of the inner Solar System such as Mars and Vesta have, according to meteorites from them, very different oxygen and tungsten isotopic compositions compared to Earth. However, Earth and the Moon have nearly identical isotopic compositions. The isotopic equalization of
10132-434: The Moon for longer than just one lunar orbit. The topography of the Moon has been measured with laser altimetry and stereo image analysis . Its most extensive topographic feature is the giant far-side South Pole–Aitken basin , some 2,240 km (1,390 mi) in diameter, the largest crater on the Moon and the second-largest confirmed impact crater in the Solar System . At 13 km (8.1 mi) deep, its floor
10281-466: The Moon formed around 50 million years after the origin of the Solar System . Historically, several formation mechanisms have been proposed, but none satisfactorily explains the features of the Earth–Moon system. A fission of the Moon from Earth's crust through centrifugal force would require too great an initial rotation rate of Earth. Gravitational capture of a pre-formed Moon depends on an unfeasibly extended atmosphere of Earth to dissipate
10430-407: The Moon have synchronized the Moon's orbital period ( lunar month ) with its rotation period ( lunar day ) at 29.5 Earth days, causing the same side of the Moon to always face Earth. The Moon's gravitational pull—and, to a lesser extent, the Sun 's—are the main drivers of Earth's tides . In geophysical terms , the Moon is a planetary-mass object or satellite planet . Its mass is 1.2% that of
10579-455: The Moon is a crescent\decrescent, [REDACTED] \ [REDACTED] , for example in M ☾ 'lunar mass' (also M L ). The lunar geological periods are named after their characteristic features, from most impact craters outside the dark mare , to the mare and later craters, and finally the young, still bright and therefore readily visible craters with ray systems like Copernicus or Tycho . Isotope dating of lunar samples suggests
10728-558: The Moon's solar illumination varies much less with season than on Earth and it allows for the existence of some peaks of eternal light at the Moon's north pole , at the rim of the crater Peary . The surface is exposed to drastic temperature differences ranging from 120 °C to −171 °C depending on the solar irradiance . Because of the lack of atmosphere, temperatures of different areas vary particularly upon whether they are in sunlight or shadow, making topographical details play
10877-403: The Moon, lūna . Selenian / s ə l iː n i ə n / is an adjective used to describe the Moon as a world, rather than as a celestial object, but its use is rare. It is derived from σελήνη selēnē , the Greek word for the Moon, and its cognate selenic was originally a rare synonym but now nearly always refers to the chemical element selenium . The element name selenium and
11026-472: The Scottish Parliament of 1597 talks of the "Chiftanis and chieffis of all clannis ... duelland in the hielands or bordouris". It has been argued that this vague phrase describes Borders families as clans. The act goes on to list the various Lowland families, including the Maxwells , Johnstones , Carruthers , Turnbulls, and other famous Border Reivers ' names. Further, Sir George MacKenzie of Rosehaugh,
11175-608: The Scottish elite. In 1639, Covenanter politician Argyll , head of Clan Campbell , was given a commission of 'fire and sword', which he used to seize MacDonald territories in Lochaber , and those held by Clan Ogilvy in Angus . As a result, both clans supported Montrose's Royalist campaign of 1644–1645 , in hopes of regaining them. When Charles II regained the throne in 1660, the Rescissory Act 1661 restored bishops to
11324-555: The Solar System relative to their primary planets. The Moon's diameter is about 3,500 km, more than a quarter of Earth's, with the face of the Moon comparable to the width of either Mainland Australia , Europe or the Contiguous United States (which excludes Alaska , etc.). The whole surface area of the Moon is about 38 million square kilometers, comparable to North and South America combined,
11473-467: The Solar System, categorizable as one of its planetary-mass moons , making it a satellite planet under the geophysical definitions of the term . It is smaller than Mercury and considerably larger than the largest dwarf planet of the Solar System, Pluto . While the minor-planet moon Charon of the Pluto-Charon system is larger relative to Pluto, the Moon is the largest natural satellite of
11622-410: The Sun, but from Earth the visible illumination shifts during its orbit, producing the lunar phases . The Moon is the brightest celestial object in Earth's night sky . This is mainly due to its large angular diameter , while the reflectance of the lunar surface is comparable to that of asphalt . The apparent size is nearly the same as that of the Sun, allowing it to cover the Sun completely during
11771-668: The Western Highlands and the Hebrides. Many Highland estates were no longer owned by clan chiefs, but landlords of both the new and old type encouraged the emigration of destitute tenants to Canada and, later, to Australia. The clearances were followed by a period of even greater emigration, which continued (with a brief lull for the First World War) up to the start of the Great Depression . Most of
11920-631: The anti-clan legislation was repealed by the end of the eighteenth century as the Jacobite threat subsided, with the Dress Act restricting kilt wearing being repealed in 1782. There was soon a process of the rehabilitation of highland culture. By the nineteenth century, tartan had largely been abandoned by the ordinary people of the region, although preserved in the Highland regiments in the British army, which poor highlanders joined in large numbers until
12069-764: The aristocracy and Gaelic-speaking clans in the Highlands and Islands . When James was deposed in the November 1688 Glorious Revolution , choice of sides was largely opportunistic. The Presbyterian Macleans backed the Jacobites to regain territories in Mull lost to the Campbells in the 1670s; the Catholic Keppoch MacDonalds tried to sack the pro-Jacobite town of Inverness, and were bought off only after Dundee intervened. Highland involvement in
12218-416: The chief as a mark of personal allegiance by the family when their head died, usually in the form of their best cow or horse. Although calps were banned by Parliament in 1617, manrent continued covertly to pay for protection. The marriage alliance reinforced links with neighboring clans as well as with families within the territory of the clan. The marriage alliance was also a commercial contract involving
12367-470: The chief chooses, are associated with that clan. There is no official list of clan septs, and the decision of what septs a clan has is left up to the clan itself. Confusingly, sept names can be shared by more than one clan, and it may be up to the individual to use his or her family history or genealogy to find the correct clan with which they are associated. Several clan societies have been granted coats of arms. In such cases, these arms are differenced from
12516-450: The chief's, much like a clan armiger . Former Lord Lyon Thomas Innes of Learney stated that such societies, according to the Law of Arms , are considered an "indeterminate cadet". Scottish clanship contained two complementary but distinct concepts of heritage. These were firstly the collective heritage of the clan, known as their dùthchas , which was their prescriptive right to settle in
12665-708: The choice was rarely simple; Donald Cameron of Lochiel committed himself only after he was provided "security for the full value of his estate should the rising prove abortive," while MacLeod and Sleat helped Charles escape after Culloden. In 1493, James IV confiscated the Lordship of the Isles from the MacDonalds. This destabilised the region, while links between the Scottish MacDonalds and Irish MacDonnells meant unrest in one country often spilled into
12814-487: The clan tartan is then recorded in the Lyon Court Books. In at least one instance a clan tartan appears in the heraldry of a clan chief and the Lord Lyon considers it to be the "proper" tartan of the clan. Originally, there appears to have been no association of tartans with specific clans; instead, highland tartans were produced to various designs by local weavers and any identification was purely regional, but
12963-433: The clans to settle criminal and civil disputes was known as arbitration , in which the aggrieved and allegedly offending sides put their cases to a panel that was drawn from the leading gentry and was overseen by the clan chief. There was no appeal against the decision made by the panel, which was usually recorded in the local royal or burgh court. Fosterage and manrent were the most important forms of social bonding in
13112-435: The clans. In the case of fosterage, the chief's children would be brought up by a favored member of the leading clan gentry and in turn their children would be favored by members of the clan. In the case of manrent, this was a bond contracted by the heads of families looking to the chief for territorial protection, though not living on the estates of the clan elite. These bonds were reinforced by calps , death duties paid to
13261-413: The combined American landmass having an area (excluding all islands) of 37.7 million square kilometers. The Moon's mass is 1/81 of Earth's, being the second densest among the planetary moons, and having the second highest surface gravity , after Io , at 0.1654 g and an escape velocity of 2.38 km/s ( 8 600 km/h; 5 300 mph) . The Moon is a differentiated body that
13410-465: The crown was certainly more straightforwardly loyal in the fourteenth century than in later periods. Alexander Armstrong, second laird of Mangerton was imprisoned and killed by the anti-Bruce conspirator William de Soulis at Hermitage Castle. Gilbert Armstrong, served as steward of the household of David II of Scotland , Master of the Horse to the king, and ambassador to England in 1363. Sir Adam Armstrong
13559-433: The crust and mantle. The absence of such neutral species (atoms or molecules) as oxygen , nitrogen , carbon , hydrogen and magnesium , which are present in the regolith , is not understood. Water vapor has been detected by Chandrayaan-1 and found to vary with latitude, with a maximum at ~60–70 degrees; it is possibly generated from the sublimation of water ice in the regolith. These gases either return into
13708-447: The dense mare basaltic lava flows that fill those basins. The anomalies greatly influence the orbit of spacecraft about the Moon. There are some puzzles: lava flows by themselves cannot explain all of the gravitational signature, and some mascons exist that are not linked to mare volcanism. The Moon has an external magnetic field of less than 0.2 nanoteslas , or less than one hundred thousandth that of Earth . The Moon does not have
13857-514: The depressions associated with impact basins , though the Moon's largest expanse of basalt flooding, Oceanus Procellarum , does not correspond to an obvious impact basin. Different episodes of lava flows in maria can often be recognized by variations in surface albedo and distinct flow margins. As the maria formed, cooling and contraction of the basaltic lava created wrinkle ridges in some areas. These low, sinuous ridges can extend for hundreds of kilometers and often outline buried structures within
14006-455: The direct heir was set aside for a more politically accomplished or belligerent relative. There were not many disputes over succession after the 16th century and, by the 17th century, the setting aside of the male heir was a rarity. This was governed and restricted by the law of Entail , which prevented estates from being divided up amongst female heirs and therefore also prevented the loss of clan territories. The main legal process used within
14155-567: The droving of cattle to the Lowlands for sale, taking a minor share of the payments made to the clan nobility, the fine . They had the important military role of mobilizing the Clan Host , both when required for warfare and more commonly as a large turnout of followers for weddings and funerals, and traditionally, in August, for hunts which included sports for the followers, the predecessors of
14304-467: The earl of Traquair. Amongst the many distinguished Armstrongs are Sir Alexander Armstrong who was an Arctic explorer, and Neil Armstrong who was the first man to walk upon the Moon , taking with him a piece of the Clan Armstrong tartan. The Armstrong Baronets are descendants of Gilnockie. Comedian Alexander Armstrong is a descendant. Edwin Howard Armstrong, the inventor of FM Radio,
14453-501: The emphasis of historians now is on the conversion of chiefs into landlords in a slow transition over a long period. The successive Jacobite rebellions, in the view of T.M. Devine, simply paused the process of change whilst the military aspects of clans regained temporary importance; the apparent surge in social change after the '45 was merely a process of catching up with the financial pressures that gave rise to landlordism. The various pieces of legislation that followed Culloden included
14602-591: The end of the Napoleonic Wars in 1815. The international craze for tartan, and for idealising a romanticised Highlands, was set off by the Ossian cycle published by James Macpherson (1736–96). Macpherson claimed to have found poetry written by the ancient bard Ossian, and published translations that acquired international popularity. Highland aristocrats set up Highland Societies in Edinburgh (1784) and other centres including London (1788). The image of
14751-468: The energy of the passing Moon. A co-formation of Earth and the Moon together in the primordial accretion disk does not explain the depletion of metals in the Moon. None of these hypotheses can account for the high angular momentum of the Earth–Moon system. The prevailing theory is that the Earth–Moon system formed after a giant impact of a Mars -sized body (named Theia ) with the proto-Earth . The oblique impact blasted material into orbit about
14900-507: The entire clan. Clans with recognised chiefs are therefore considered a noble community under Scots law . A group without a chief recognised by the Sovereign, through the Lord Lyon, has no official standing under Scottish law. Claimants to the title of chief are expected to be recognised by the Lord Lyon as the rightful heir to the undifferenced arms of the ancestor of the clan of which the claimant seeks to be recognized as chief. A chief of
15049-524: The estate settled by their clan. This was known as their oighreachd and gave a different emphasis to the clan chief's authority in that it gave the authority to the chiefs and leading gentry as landed proprietors, who owned the land in their own right, rather than just as trustees for the clan. From the beginning of Scottish clanship, the clan warrior elite, who were known as the ‘fine’, strove to be landowners as well as territorial war lords. The concept of dùthchas mentioned above held precedence in
15198-523: The exchange of livestock, money, and land through payments in which the bride was known as the tocher and the groom was known as the dowry . Clan gatherings are a unique feature of Scottish clan culture, where members of a clan convene to celebrate their shared heritage, participate in Highland Games , and discuss clan business. These events serve as a focal point for clan members and help in preserving historical and cultural landmarks, as well as
15347-422: The expansion of plasma clouds. These clouds are generated during large impacts in an ambient magnetic field. This is supported by the location of the largest crustal magnetizations situated near the antipodes of the giant impact basins. The Moon has an atmosphere so tenuous as to be nearly vacuum , with a total mass of less than 10 tonnes (9.8 long tons; 11 short tons). The surface pressure of this small mass
15496-1182: The exposed ones. Conversely, mare lava has obscured many impact melt sheets and pools. Impact melts are formed when intense shock pressures from collisions vaporize and melt zones around the impact site. Where still exposed, impact melt can be distinguished from mare lava by its distribution, albedo, and texture. Sinuous rilles , found in and around maria, are likely extinct lava channels or collapsed lava tubes . They typically originate from volcanic vents , meandering and sometimes branching as they progress. The largest examples, such as Schroter's Valley and Rima Hadley , are significantly longer, wider, and deeper than terrestrial lava channels, sometimes featuring bends and sharp turns that again, are uncommon on Earth. Mare volcanism has altered impact craters in various ways, including filling them to varying degrees, and raising and fracturing their floors from uplift of mare material beneath their interiors. Examples of such craters include Taruntius and Gassendi . Some craters, such as Hyginus , are of wholly volcanic origin, forming as calderas or collapse pits . Such craters are relatively rare, and tend to be smaller (typically
15645-510: The first human-made objects to leave Earth and reach another body arrived at the Moon, with the flyby of the Soviet Union 's Luna 1 and the intentional impact of Luna 2 . In 1966, the Moon became the first extraterrestrial body with a soft landing by Luna 9 and a orbital insertion by Luna 10 were achieved . On July 20, 1969, humans for the first time landed on the Moon and any extraterrestrial body, at Mare Tranquillitatis with
15794-412: The first phase of clearance, when agricultural improvement was introduced, many of the peasant farmers were evicted and resettled in newly created crofting communities, usually in coastal areas. The small size of the crofts were intended to force the tenants to work in other industries, such as fishing or the kelp industry. With a shortage of work, the numbers of Highlanders who became seasonal migrants to
15943-427: The flood lavas that erupted onto the surface from partial melting in the mantle confirm the mafic mantle composition, which is more iron-rich than that of Earth. The crust is on average about 50 kilometres (31 mi) thick. The Moon is the second-densest satellite in the Solar System, after Io . However, the inner core of the Moon is small, with a radius of about 350 kilometres (220 mi) or less, around 20% of
16092-548: The idea of a clan-specific tartan gained currency in the late 18th century and in 1815 the Highland Society of London began the naming of clan-specific tartans. Many clan tartans derive from a 19th-century hoax known as the Vestiarium Scoticum . The Vestiarium was composed by the " Sobieski Stuarts ", who passed it off as a reproduction of an ancient manuscript of clan tartans. It has since been proven
16241-471: The lander Eagle of the United States ' Apollo 11 mission. Five more crews were sent between then and 1972, each with two men landing on the surface. The longest stay was 75 hours by the Apollo 17 crew. Since then, exploration of the Moon has continued robotically, and crewed missions are being planned to return beginning in the late 2020s. The usual English proper name for Earth's natural satellite
16390-511: The law. After the Restoration of the monarchy in 1660, the incidents of feuding between clans declined considerably. The last "clan" feud that led to a battle and which was not part of a civil war was the Battle of Mulroy , which took place on 4 August 1688. Cattle raiding, known as "reiving" , had been normal practice prior to the 17th century. It was also known as creach , where young men took livestock from neighbouring clans. By
16539-531: The legal right to outlaw anyone from his clan, including members of his own family. Today, anyone who has the chief's surname is automatically considered to be a member of the chief's clan. Also, anyone who offers allegiance to a chief becomes a member of the chief's clan, unless the chief decides not to accept that person's allegiance. Clan membership goes through the surname. Children who take their father's surname are part of their father's clan and not their mother's. However, there have been several cases where
16688-730: The legendary hero of Ulster . Whilst their political enemies the Clan Campbell have claimed as their progenitor Diarmaid the Boar , who was rooted in the Fingalian or Fenian Cycle . In contrast, the Clans Grant , Mackinnon and Gregor claimed ancestry from the Siol Alpin family, who descend from Alpin , father of Kenneth MacAlpin , who united the Scottish kingdom in 843. Only one confederation of clans, which included
16837-421: The magma ocean had crystallized, lower-density plagioclase minerals could form and float into a crust atop. The final liquids to crystallize would have been initially sandwiched between the crust and mantle, with a high abundance of incompatible and heat-producing elements. Consistent with this perspective, geochemical mapping made from orbit suggests a crust of mostly anorthosite . The Moon rock samples of
16986-421: The majority of clan leaders advised Prince Charles to return to France, including MacDonald of Sleat and Norman MacLeod . By arriving without French military support, they felt Charles failed to keep his commitments, while it is also suggested Sleat and MacLeod were vulnerable to government sanctions due to their involvement in illegally selling tenants into indentured servitude . Enough were persuaded, but
17135-521: The mantle could be responsible for prolonged activities on the far side in the Orientale basin. The lighter-colored regions of the Moon are called terrae , or more commonly highlands , because they are higher than most maria. They have been radiometrically dated to having formed 4.4 billion years ago, and may represent plagioclase cumulates of the lunar magma ocean. In contrast to Earth, no major lunar mountains are believed to have formed as
17284-406: The mare. Another result of maria formation is the creation of concentric depressions along the edges, known as arcuate rilles . These features occur as the mare basalts sink inward under their own weight, causing the edges to fracture and separate. In addition to the visible maria, the Moon has mare deposits covered by ejecta from impacts. Called cryptomares, these hidden mares are likely older than
17433-399: The modern Highland games . Where the oighreachd (land owned by the clan elite or fine ) did not match the common heritage of the dùthchas (the collective territory of the clan) this led to territorial disputes and warfare. The fine resented their clansmen paying rent to other landlords. Some clans used disputes to expand their territories. Most notably, the Clan Campbell and
17582-540: The most Gaelic part of Ireland, the Plantation of Ulster tried to ensure stability in Western Scotland by importing Scots and English Protestants. This process was often supported by the original owners; in 1607 Sir Randall MacDonnell settled 300 Presbyterian Scots families on his land in Antrim. This ended the Irish practice of using Highland gallowglass , or mercenaries. The 1609 Statutes of Iona imposed
17731-610: The national cause against the English . For example, the Clan MacDonald were elevated above the Clan MacDougall , two clans who shared a common descent from a great Norse-Gaelic warlord named Somerled of the 12th century. Clanship was thus not only a strong tie of local kinship but also of feudalism to the Scottish Crown. It is this feudal component, reinforced by Scots law, that separates Scottish clanship from
17880-407: The natural environment of Scotland. Clan affiliations aren't solely based on ancestry; people with no Scottish lineage can also be affiliated with a clan, commonly known as "Clan Friends." Rents from those living within the clan estate were collected by the tacksmen . These lesser gentry acted as estate managers, allocating the runrig strips of land, lending seed-corn and tools and arranging
18029-524: The near side of the Moon, and cover 31% of the surface of the near side compared with 2% of the far side. This is likely due to a concentration of heat-producing elements under the crust on the near side, which would have caused the underlying mantle to heat up, partially melt, rise to the surface and erupt. Most of the Moon's mare basalts erupted during the Imbrian period , 3.3–3.7 billion years ago, though some being as young as 1.2 billion years and as old as 4.2 billion years. In 2006,
18178-440: The near-side. Causes of the distribution of the lunar highlands on the far side are also not well understood. Topological measurements show the near side crust is thinner than the far side. One possible scenario then is that large impacts on the near side may have made it easier for lava to flow onto the surface. The Moon is a very slightly scalene ellipsoid due to tidal stretching, with its long axis displaced 30° from facing
18327-483: The ordinary clansmen rarely had any blood tie of kinship with the clan chiefs, but they sometimes took the chief's surname as their own when surnames came into common use in the sixteenth and seventeenth centuries. Thus, by the eighteenth century the myth had arisen that the whole clan was descended from one ancestor, perhaps relying on Scottish Gaelic clann originally having a primary sense of 'children' or 'offspring'. About 30% of Scottish families are attached to
18476-416: The original clan symbol. However, Thomas Innes of Learney claimed the heraldic flags of clan chiefs would have been the earliest means of identifying Scottish clans in battle or at large gatherings. Moon The Moon is Earth 's only natural satellite . It orbits at an average distance of 384,400 km (238,900 mi), about 30 times the diameter of Earth. Tidal forces between Earth and
18625-412: The original markers were merely specific plants worn in bonnets or hung from a pole or spear. Clan badges are another means of showing one's allegiance to a Scottish clan. These badges, sometimes called plant badges, consist of a sprig of a particular plant. They are usually worn in a bonnet behind the Scottish crest badge; they can also be attached at the shoulder of a lady's tartan sash , or be tied to
18774-427: The other. James VI took various measures to deal with the resulting instability, including the 1587 'Slaughter under trust' law, later used in the 1692 Glencoe Massacre . To prevent endemic feuding, it required disputes to be settled by the Crown, specifically murder committed in 'cold-blood', once articles of surrender had been agreed, or hospitality accepted. Its first recorded use was in 1588, when Lachlan Maclean
18923-585: The parents that it is difficult to convince them that it can be any benefit to their children to learn Gaelic, though they are all anxious ... to have them taught English". The second phase of the Highland clearances affected overpopulated crofting communities which were no longer able to support themselves due to famine and/or collapse of the industries on which they relied. "Assisted passages" were provided to destitute tenants by landlords who found this cheaper than continued cycles of famine relief to those in substantial rent arrears. This applied particularly to
19072-594: The peace on the border. In around 1425 John Armstrong, brother of Armstrong of Mangerton in Liddesdale built a strong tower. The Armstrongs were able to raise three thousand horsemen and were said to be at one point in control of the debatable lands. In 1528, Lord Dacre , who was the English Warden of the Marches , attacked the Armstrongs' tower but the Armstrongs retaliated and burned Netherby. The power of
19221-478: The permission of the clan chief; and the Lyon Court has intervened in cases where permission has been withheld. Scottish crest badges, much like clan-specific tartans , do not have a long history, and owe much to Victorian era romanticism , having only been worn on the bonnet since the 19th century. The concept of a clan badge or form of identification may have some validity, as it is commonly stated that
19370-432: The possibility of a much warmer lunar mantle than previously believed, at least on the near side where the deep crust is substantially warmer because of the greater concentration of radioactive elements. Evidence has been found for 2–10 million years old basaltic volcanism within the crater Lowell, inside the Orientale basin. Some combination of an initially hotter mantle and local enrichment of heat-producing elements in
19519-587: The prefix seleno- (as in selenography , the study of the physical features of the Moon) come from this Greek word. Artemis , the Greek goddess of the wilderness and the hunt, came to also be identified as the goddess of the Moon ( Selene ) and was sometimes called Cynthia , after her birthplace on Mount Cynthus . Her Roman equivalent is Diana . The names Luna, Cynthia, and Selene are reflected in technical terms for lunar orbits such as apolune , pericynthion and selenocentric . The astronomical symbol for
19668-436: The radius of the Moon. Its composition is not well understood, but is probably metallic iron alloyed with a small amount of sulfur and nickel; analyzes of the Moon's time-variable rotation suggest that it is at least partly molten. The pressure at the lunar core is estimated to be 5 GPa (49,000 atm). On average the Moon's surface gravity is 1.62 m/s ( 0.1654 g ; 5.318 ft/s ), about half of
19817-471: The regolith because of the Moon's gravity or are lost to space, either through solar radiation pressure or, if they are ionized, by being swept away by the solar wind's magnetic field. Studies of Moon magma samples retrieved by the Apollo missions demonstrate that the Moon had once possessed a relatively thick atmosphere for a period of 70 million years between 3 and 4 billion years ago. This atmosphere, sourced from gases ejected from lunar volcanic eruptions,
19966-529: The romantic highlands was further popularised by the works of Walter Scott . His "staging" of the royal visit of King George IV to Scotland in 1822 and the King's wearing of tartan, resulted in a massive upsurge in demand for kilts and tartans that could not be met by the Scottish linen industry. The designation of individual clan tartans was largely defined in this period and they became a major symbol of Scottish identity. This "Highlandism", by which all of Scotland
20115-410: The second highest among all Solar System moons, after Jupiter 's moon Io . The body of the Moon is differentiated and terrestrial , with no significant hydrosphere , atmosphere , or magnetic field . It formed 4.51 billion years ago, not long after Earth's formation , out of the debris from a giant impact between Earth and a hypothesized Mars-sized body called Theia . The lunar surface
20264-460: The surface gravity of Mars and about a sixth of Earth's. The Moon's gravitational field is not uniform. The details of the gravitational field have been measured through tracking the Doppler shift of radio signals emitted by orbiting spacecraft. The main lunar gravity features are mascons , large positive gravitational anomalies associated with some of the giant impact basins, partly caused by
20413-400: The territories in which the chiefs and leading gentry of the clan customarily provided protection. This concept was where all clansmen recognised the personal authority of the chiefs and leading gentry as trustees for their clan. The second concept was the wider acceptance of the granting of charters by the Crown and other powerful landowners to the chiefs, chieftains and lairds which defined
20562-595: The wars between the Irish Gaels and the English Tudor monarchy in the 16th century. Within these clans, there evolved a military caste of members of the lesser gentry who were purely warriors and not managers, and who migrated seasonally to Ireland to fight as mercenaries. There was heavy feuding between the clans during the civil wars of the 1640s; however, by this time, the chiefs and leading gentry preferred increasingly to settle local disputes by recourse to
20711-446: The winter solstice in the north polar crater Hermite . This is the coldest temperature in the Solar System ever measured by a spacecraft, colder even than the surface of Pluto . Blanketed on top of the Moon's crust is a highly comminuted (broken into ever smaller particles) and impact gardened mostly gray surface layer called regolith , formed by impact processes. The finer regolith, the lunar soil of silicon dioxide glass, has
20860-417: The world. It is a common misconception that every person who bears a clan's name is a lineal descendant of the chiefs. Many clansmen, although not related to the chief, took the chief's surname as their own either to show solidarity or to obtain basic protection or for much needed sustenance. Most of the followers of the clan were tenants, who supplied labour to the clan leaders. Contrary to popular belief,
21009-606: Was common over the whole of Northumbria and the Scottish Borders . The Armstrongs became a powerful and warlike clan in Liddesdale and the Debatable Lands . Historian George Fraser Black lists Adam Armstrong in 1235 as being pardoned for causing the death of another man. By tradition, the Armstrongs followed the cause of Robert the Bruce in the Scottish Wars of Independence, and their recorded relationship with
21158-589: Was elected to the Dublin parliament and fought for the crown in the armies of the Earl of Ormonde and the Earl of Inchiquin. He and his sons Thomas and William engaged actively in royalist conspiracies against the Cromwellian Protectorate through the following decade. William ("Christie's Will") Armstrong, perhaps the last of the clan's famous border freebooters, also fought for the crown as a servant of
21307-476: Was identified with the culture of the Highlands, was cemented by Queen Victoria 's interest in the country, her adoption of Balmoral Castle as a major royal retreat from and her interest in "tartenry". The revival of interest, and demand for clan ancestry, has led to the production of lists and maps covering the whole of Scotland giving clan names and showing territories, sometimes with the appropriate tartans . While some lists and clan maps confine their area to
21456-424: Was initially in hydrostatic equilibrium but has since departed from this condition. It has a geochemically distinct crust , mantle , and core . The Moon has a solid iron-rich inner core with a radius possibly as small as 240 kilometres (150 mi) and a fluid outer core primarily made of liquid iron with a radius of roughly 300 kilometres (190 mi). Around the core is a partially molten boundary layer with
21605-470: Was listed in 1374 as one of the knights permitted to travel outside Scotland with the Earl of March and Dunbar, then the principal defender of the Scottish border. Fourteen years later, John Armstrong fought in the army of James, second Earl Douglas at the Battle of Otterburn. In 1398, Alexander, David and Geoffrey Armstrong committed their signatures as 'borowis' for the third Earl of Douglas in pledging to keep
21754-469: Was made up of everyone who lived on the chief's territory, or on territory of those who owed allegiance to the said chief. Through time, with the constant changes of "clan boundaries", migration or regime changes, clans would be made up of large numbers of members who were unrelated and who bore different surnames. Often, those living on a chief's lands would, over time, adopt the clan surname. A chief could add to his clan by adopting other families, and also had
21903-399: Was promulgated by the Scottish author Sir Walter Scott after influence by others. Historically, tartan designs were associated with Lowland and Highland districts whose weavers tended to produce cloth patterns favoured in those districts. By process of social evolution, it followed that the clans/families prominent in a particular district would wear the tartan of that district, and it was but
22052-576: Was prosecuted for the murder of his new stepfather, John MacDonald, and 17 other members of the MacDonald wedding party. Other measures had limited impact; imposing financial sureties on landowners for the good behaviour of their tenants often failed, as many were not regarded as the clan chief. The 1603 Union of the Crowns coincided with the end of the Anglo-Irish Nine Years' War , followed by land confiscations in 1608 . Previously
22201-401: Was twice the thickness of that of present-day Mars . The ancient lunar atmosphere was eventually stripped away by solar winds and dissipated into space. A permanent Moon dust cloud exists around the Moon, generated by small particles from comets. Estimates are 5 tons of comet particles strike the Moon's surface every 24 hours, resulting in the ejection of dust particles. The dust stays above
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