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Moon : the earth’s natural satellite (see satellite 2a) that shines by the sun’s reflected light, revolves about the earth from west to east in about 291⁄2 days with reference to the sun or about 271⁄3 days with reference to the stars, and has a diameter of 2160 miles (3475 kilometers), a mean distance from the earth of about 238,900 miles (384,400 kilometers), and a mass about one eightieth that of the earth (often capitalized : usually used with the) — Webster
The Moon is an astronomical body that orbits planet Earth, being Earth’s only permanent natural satellite. It is the fifth-largest natural satellite in the Solar System, and the largest among planetary satellites relative to the size of the planet that it orbits (its primary). Following Jupiter’s satellite Io, the Moon is second-densest satellite among those whose densities are known. The average distance of the Moon from the Earth is 384,400 km (238,900 mi), or 1.28 light-seconds.
The Moon is in synchronous rotation with Earth, always showing the same face, with its near side marked by dark volcanic maria that fill the spaces between the bright ancient crustal highlands and the prominent impact craters. It is the second-brightest regularly visible celestial object in Earth’s sky, after the Sun, as measured by illuminance on Earth’s surface. Its surface is actually dark, although compared to the night sky it appears very bright, with a reflectance just slightly higher than that of worn asphalt. Its prominence in the sky and its regular cycle of phases have made the Moon an important cultural influence since ancient times on language, calendars, art, and mythology.
The Moon’s gravitational influence produces the ocean tides, body tides, and the slight lengthening of the day. The Moon’s current orbital distance is about thirty times the diameter of Earth, with its apparent size in the sky almost the same as that of the Sun, resulting in the Moon covering the Sun nearly precisely in total solar eclipse. This matching of apparent visual size will not continue in the far future. The Moon’s linear distance from Earth is currently increasing at a rate of 3.82 ± 0.07 centimetres (1.504 ± 0.028 in) per year, but this rate is not constant. — Wikipedia
Moon News -- ScienceDaily Moon News. Current science articles on the Moon. Read about the new lunar mission being planned, how the "Man In The Moon" was created, moon landing facts and more. Images.
First global map of water in moon's soil
on September 13, 2017 at 11:30 pm
A new study maps the trace concentrations of water implanted in the lunar soil by the solar wind, a water source that could be used as resource in future lunar exploration. […]
New gravity map suggests Mars has a porous crust
on September 13, 2017 at 11:30 pm
Scientists have found evidence that Mars' crust is not as dense as previously thought, a clue that could help researchers better understand the Red Planet's interior structure and evolution. […]
NASA's Lunar mission captures solar eclipse as...
on August 29, 2017 at 8:45 pm
LRO captured an image of the Moon's shadow over a large region of the United States, centered just north of Nashville, Tennessee. […]
Analysis of a 'rusty' lunar rock suggests the...
on August 21, 2017 at 7:11 pm
The moon is likely very dry in its interior according to a new study analyzing fragments of the 'Rusty Rock,' a rock collected from the moon's surface during the Apollo 16 mission in 1972. […]
Lunar dynamo's lifetime extended by at least 1...
on August 9, 2017 at 6:20 pm
Astronomers report that a lunar rock collected by NASA's Apollo 15 mission exhibits signs that it formed 1 to 2.5 billion years ago in the presence of a relatively weak magnetic field of about 5 microtesla. That's around 10 times weaker than Earth's current magnetic field but still 1,000 times […]