Moon

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{{dablink|This article is about Earth's moon. For moons in general, see [[Moons]].}}{{Place Planet|
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{{dablink|This article is about Earth's moon. For a list of other moons, see [[Moons]].}}{{Place Planet|
place_name=Earth's Moon|
place_name=Earth's Moon|
image=[[image:Moon.gif]]|
image=[[image:Moon.gif]]|
discovered=Always known to humanity.|
discovered=Always known to humanity.|
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naming=Named after the Roman God|
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naming=Colloquial Term|
size=Planet Standard|
size=Planet Standard|
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satellites='''Notable Satellites'''
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satellites=None
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* The [[Moon]]
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}}The [[Moon]] is [[Earth|Earth's]] only natural satellite. It has no formal name other than "the Moon", although it is occasionally called ''Luna'' (Latin: moon) to distinguish it from the generic term "moon" (referring to any of the various natural satellites of other planets). Its symbol is a crescent (☽). The related adjective for the Moon is lunar (from the Latin root).
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* [[Colonies|Terran Colonies]]|
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}}[[Earth]] (often referred to as ''Terra'', the World or Planet Earth) is the third planet in the [[Olympus Major System|solar system]] in terms of distance from the Sun, and the fifth largest. It is also the largest of its planetary system's terrestrial planets, making it the largest solid body in the solar system, and it is the only place in the universe known to humans to support life. It is also the densest planet in the solar system.
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==History==
==History==
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The Earth formed 4.567 billion years ago out of the solar nebula, along with the [[Sol|Sun]] and the other planets. Initially molten, the outer layer of the planet cooled when water began accumulating in the atmosphere when the planet was about half its current radius, resulting in the solid crust. The moon formed soon afterwards, possibly as the result of the impact with a [[Mars]]-sized object known as Theia.
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The Moon has been the subject of many works of art and literature and the inspiration for countless others. A 5,000 year old rock carving at Knowth, Ireland may represent the Moon, which would be the earliest depiction discovered. In many prehistoric and ancient cultures, the Moon was thought to be a deity or other supernatural phenomenon, and astrological views of the Moon continue to be propagated today.
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In 1609, Galileo Galilei drew one of the first telescopic drawings of the Moon in his book Sidereus Nuncius and noted that it was not smooth but had mountains and craters. Later in the 17th century, Giovanni Battista Riccioli and Francesco Maria Grimaldi drew a map of the Moon and gave many craters the names they still have today.
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The development of photosynthesis allowed the sun's energy to be harvested directly; the resultant oxygen accumulated in the atmosphere and gave rise to the ozone layer. The incorporation of smaller cells within larger ones resulted in the development of complex cells called eukaryotes. Cells within colonies became increasingly specialized, resulting in true multicellular organisms. Aided by the absorption of harmful ultraviolet radiation by the ozone layer, life colonized the surface of Earth.
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On maps, the dark parts of the Moon's surface were called ''maria'' (singular ''mare'') or seas, and the light parts were called ''terrae'' or continents. The possibility that the Moon could contain vegetation and be inhabited by selenites was seriously considered by some major astronomers even into the first decades of the 19th century. The contrast between the brighter highlands and darker maria create the patterns seen by different cultures as the Man in the Moon, the rabbit and the buffalo, amongst others.
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Around 535 million years ago, there have been five mass extinctions. Over the past 65 million years, mammalian life has diversified, and several mya, a small African ape gained the ability to stand upright. This enabled tool use and encouraged communication that provided the nutrition and stimulation needed for a larger brain. The development of agriculture, and then civilization, allowed humans to influence the Earth in a short timespan as no other life form had, affecting both the nature and quantity of other life forms.
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====Exploration====
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y
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====Modern Uses====
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y
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====The fracturing of the Moon====
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AC 275
==Meaning of the Name==
==Meaning of the Name==

Revision as of 01:31, 18 January 2007

Earth's Moon
image:Moon.gif
Discovered: Always known to humanity.
Named After: Colloquial Term
Relative Size: Planet Standard
Satellites: None

The Moon is Earth's only natural satellite. It has no formal name other than "the Moon", although it is occasionally called Luna (Latin: moon) to distinguish it from the generic term "moon" (referring to any of the various natural satellites of other planets). Its symbol is a crescent (☽). The related adjective for the Moon is lunar (from the Latin root).

Contents

History

The Moon has been the subject of many works of art and literature and the inspiration for countless others. A 5,000 year old rock carving at Knowth, Ireland may represent the Moon, which would be the earliest depiction discovered. In many prehistoric and ancient cultures, the Moon was thought to be a deity or other supernatural phenomenon, and astrological views of the Moon continue to be propagated today.

In 1609, Galileo Galilei drew one of the first telescopic drawings of the Moon in his book Sidereus Nuncius and noted that it was not smooth but had mountains and craters. Later in the 17th century, Giovanni Battista Riccioli and Francesco Maria Grimaldi drew a map of the Moon and gave many craters the names they still have today.

On maps, the dark parts of the Moon's surface were called maria (singular mare) or seas, and the light parts were called terrae or continents. The possibility that the Moon could contain vegetation and be inhabited by selenites was seriously considered by some major astronomers even into the first decades of the 19th century. The contrast between the brighter highlands and darker maria create the patterns seen by different cultures as the Man in the Moon, the rabbit and the buffalo, amongst others.

Exploration

y

Modern Uses

y

The fracturing of the Moon

AC 275

Meaning of the Name

The English word "earth" has cognates in many modern and ancient languages. Examples in modern tongues include aarde in Afrikaans and Dutch, and Erde in German. The root has cognates in extinct languages such as ertha in Old Saxon and ert (meaning "ground") in Middle Irish, derived from the Old English eorðe. All of these words derive from the Proto-Indo-European base *er-.

Words for Earth in other languages include: Terre (French), पृथ्वी pr̥thvī (Sanskrit), Maa (Finnish and Estonian), Pământ (Romanian), Föld (Hungarian), Ziemia (Polish), Zemlja (Russian and Serbian), Zemya Земя (Bulgarian), Tierra (Spanish), Terra (Italian), Diqiu (Mandarin), Deiqao (Cantonese), Jigu (Korean), Bumi (Malay), Chikyuu (Japanese), Jorden (Danish, Norwegian, Swedish), כדור הארץ (Hebrew), Bhoomi (Telugu), Gi, Choma (Greek), Dunia (Swahili), Âlem, Dünya الْمَسْكُونَة (Arabic), Dinê (Kurdish), Ergir երկիր (Armenian), Jehun, Zamin (Persian), and Acun, Yeryüzü, Yerküre (Turkish).

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