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In geophysical terms, the Moon is a planetary-mass object or satellite planet. Its mass is 1.2% that of 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).
- Natural Satellite
The Moon orbiting around Earth (observed by the Deep Space...
- Moon (Disambiguation)
Moon (Transformers), a character in Beast Wars II Moon, a...
- View Source
We would like to show you a description here but the site...
- Far Side of The Moon
Photograph of the far side of the Moon, with Mare Orientale...
- Origin of The Moon
The Moon's heavily cratered far-side. The origin of the Moon...
- Atmosphere of The Moon
Surveyor 7 observes levitating dust, a phenomenon named...
- Near Side of The Moon
The names of the major maria and some craters on the near...
- Tidal Locking
Tidal locking results in the Moon rotating about its axis in...
- Planetary-Mass Object
Planetary-mass satellites larger than Pluto, the largest...
- Satellite Planet
Planetary-mass moons larger than Pluto, the largest Solar...
- Natural Satellite
Earth is orbited by one permanent natural satellite, the Moon, which orbits Earth at 384,400 km (1.28 light seconds) and is roughly a quarter as wide as Earth. The Moon's gravity helps stabilize Earth's axis, causes tides and gradually slows Earth's rotation .
Geologic map of the Moon, with general features colored in by age, except in the case of maria (in blue), KREEP (red) and other special features. Oldest to youngest: Aitkenian (pink), Nectarian (brown), Imbrian (greens/turquoise), Eratosthenian (light orange) and Copernican (yellow).
Earth and the Moon orbit about their barycentre (common centre of mass), which lies about 4,670 km (2,900 mi) from Earth's centre (about 73% of its radius), forming a satellite system called the Earth–Moon system.
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- Variation
- History of Measurement
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Because of the influence of the sun and other perturbations, the moon does not travel on a true ellipse around the earth. Different methods have been used to nevertheless define a semi-major axis. Ernest William Brown provided a formula for the parallax of the moon as viewed from opposite sides of the earth, involving trigonometric terms. This is e...
The instantaneous lunar distance is constantly changing. The actual distance between the Moon and Earth can change as quickly as 75 meters per second, or more than 1,000 km (620 mi) in just 6 hours, due to its non-circular orbit.There are other effects that also influence the lunar distance. Some factors include: The formula of Chapront and Touzé b...
Until the late 1950s all measurements of lunar distance were based on optical angular measurements: the earliest accurate measurement was by Hipparchusin the 2nd century BC. The space age marked a turning point when the precision of this value was much improved. During the 1950s and 1960s, there were experiments using radar, lasers, and spacecraft,...
Apr 20, 2020 · This animation shows a rotating globe of the new Unified Geologic Map of the Moon with shaded topography from the Lunar Orbiter Laser Altimeter (LOLA). This geologic map is a synthesis of six Apollo-era regional geologic maps, updated based on data from recent satellite missions.
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The brightest and largest object in our night sky, the Moon makes Earth a more livable planet by moderating our home planet's wobble on its axis, leading to a relatively stable climate. It also causes tides, creating a rhythm that has guided humans for thousands of years.
