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Moon comparison table |
Subject | has crust thickness | is part of | is a kind of | has sidereal period | has V< i>esc | has inclination of orbital plane to ecliptic | has mean radiu | has mantle thickness | is an instance of | has mean density | has orbital velocity | has core temperature | has surface gravity | has mass | has center of mass location | has synodic period | has obliquity | has albedo | has definition | has eccentricity | has mean distance from Earth |
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natural satellite | satellite | Body orbiting a planet. Since 1957 the term has also been applied to man-made (artificial) satellites; many astronomers make the distinction by calling natural satellites moons (and the Earth's natural satellite the Moon). | |||||||||||||||||||
Moon | 60 km | Earth | 27d7h43m11s | 2.38 km s-1 | 5°8'43" | 1738 km | 1000 km | natural satellite | 3.34 g cm-3 | Vorb = 1.02 km s-1 | 1500 K | 162.2 cm s-2 = 0.165 Earth's | 7.35 × 1025 g = 0.0123 MEarth | displaced about 2 km from geometrical center towards the direction of Earth | 29d12h44m2s.9 | 6°41' | 0.07 | Natural satellite of Earth. Studies of lunar rocks have shown that melting and separation must have begun at least 4.5 × 109 years ago,so the crust of the Moon was beginning to form a very short time after the solar system itself. It would have taken only 107 years to slow the Moon's rotation into its present lock with its orbital period. The Moon's orbit is always concave toward the Sun. | e = 0.0549 | 384404.377 ± 0.001 km (1.28 lt-sec) |
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