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- Moon - Wikipedia
The Moon is Earth's only natural satellite It orbits around Earth at an average distance of 384 399 km (238,854 mi; about 30 times Earth's diameter) The Moon is tidally locked to Earth This makes the Moon's near side face Earth always the same way, and synchronizes its rotation period to its orbital period (lunar month) of 29 5 Earth days
- Origin of the Moon - Wikipedia
The origin of the Moon is usually explained by a Mars-sized body, known as Theia, striking the Earth, creating a debris ring that eventually collected into a single natural satellite, the Moon, but there are a number of variations on this giant-impact hypothesis, as well as alternative explanations, and research continues into how the Moon came
- List of missions to the Moon - Wikipedia
Missions to the Moon have been numerous and include some of the earliest space missions, conducting exploration of the Moon since 1959 The first partially successful lunar mission was Luna 1 (January 1959), the first probe to leave Earth and fly past another astronomical body
- Orbit of the Moon - Wikipedia
The Moon orbits Earth in the prograde direction and completes one revolution relative to the Vernal Equinox and the fixed stars in about 27 3 days (a tropical month and sidereal month), and one revolution relative to the Sun in about 29 5 days (a synodic month)
- Moon - Simple English Wikipedia, the free encyclopedia
The Moon is Earth's only natural satellite (the only object which orbits the Earth and is not man-made) It is usually visible in the night sky, but is sometimes seen during the day The Moon is about one-fourth of the width of Earth [8] Because it is so far away it looks small in the sky, about half a degree wide
- Lunar phase - Wikipedia
A lunar phase or Moon phase is the apparent shape of the Moon's directly sunlit portion as viewed from the Earth Because the Moon is tidally locked with the Earth, the same hemisphere is always facing the Earth
- Moon | Features, Phases, Surface, Exploration, Facts | Britannica
Moon, Earth’s sole natural satellite and nearest celestial body Known since prehistoric times, it is the brightest object in the sky after the Sun Its name in English, like that of Earth, is of Germanic and Old English derivation
- Moon Facts - Science@NASA
As the Moon orbits Earth, different parts are in sunlight or darkness at different times The changing illumination is why, from our perspective, the Moon goes through phases During a "full moon," the hemisphere of the Moon we can see from Earth is fully illuminated by the Sun
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