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  2. Moon - Wikipedia

    en.wikipedia.org/wiki/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 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 ...

  3. Orbit of the Moon - Wikipedia

    en.wikipedia.org/wiki/Orbit_of_the_Moon

    Every 18.6 years, the angle between the Moon's orbit and Earth's equator reaches a maximum of 28°36′, the sum of Earth's equatorial tilt (23°27′) and the Moon's orbital inclination (5°09′) to the ecliptic. This is called major lunar standstill. Around this time, the Moon's declination will vary from −28°36′ to +28°36′.

  4. Atmosphere of the Moon - Wikipedia

    en.wikipedia.org/wiki/Atmosphere_of_the_Moon

    Atmosphere of the Moon. The thin lunar atmosphere is visible on the Moon's surface at sunrise and sunset with the lunar horizon glow [1] and lunar twilight rays, like Earth's crepuscular rays. This Apollo 17 sketch depicts the glow and rays [2] among the general zodiacal light [3][4]. The atmosphere of the Moon is a very sparse layer of gases ...

  5. Geology of the Moon - Wikipedia

    en.wikipedia.org/wiki/Geology_of_the_Moon

    Geological studies of the Moon are based on a combination of Earth-based telescope observations, measurements from orbiting spacecraft, lunar samples, and geophysical data. . Six locations were sampled directly during the crewed Apollo program landings from 1969 to 1972, which returned 382 kilograms (842 lb) of lunar rock and lunar soil to Earth [8] In addition, three robotic Soviet Luna ...

  6. Lunar distance - Wikipedia

    en.wikipedia.org/wiki/Lunar_distance

    Lunar distance. A lunar distance, 384,399 km (238,854 mi), is the Moon's average distance to Earth. The actual distance varies over the course of its orbit. The image compares the Moon's apparent size when it is nearest and farthest from Earth. General information.

  7. Lunar resources - Wikipedia

    en.wikipedia.org/wiki/Lunar_resources

    Lunar resources. An artificially colored mosaic constructed from a series of 53 images taken through three spectral filters by Galileo's imaging system as the spacecraft flew over the northern regions of the Moon on 7 December 1992. The colors indicate different materials. A lunar anorthosite rock collected by the Apollo 16 crew from near the ...

  8. Europa (moon) - Wikipedia

    en.wikipedia.org/wiki/Europa_(moon)

    0.1 μPa (10 −12 bar) [15] Europa / jʊˈroʊpə / ⓘ, or Jupiter II, is the smallest of the four Galilean moons orbiting Jupiter, and the sixth-closest to the planet of all the 95 known moons of Jupiter. It is also the sixth-largest moon in the Solar System. Europa was discovered independently by Simon Marius and Galileo Galilei [2] and was ...

  9. List of lunar features - Wikipedia

    en.wikipedia.org/wiki/List_of_lunar_features

    List of lunar features. The surface of the Moon has many features, including mountains and valleys, craters, and maria —wide flat areas that look like seas from a distance but are probably solidified molten rock. Some of these features are listed.

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