Related topics: nasa · earth · spacecraft · saturn · cassini spacecraft

Study shows that the Moon is older than previously believed

A new study spearheaded by Earth scientists at the University of Cologne's Institute of Geology and Mineralogy has constrained the age of the Moon to approximately 50 million years after the formation of the solar system. ...

India's Moon probe enters lunar orbit

India's Chandrayaan 2 spacecraft entered lunar orbit on Tuesday, executing one of the trickiest manoeuvres on its historic mission to the Moon.

Thanks, Gaia: Astronomers spy Europa blocking distant star

On 31 March 2017, Jupiter's moon Europa passed in front of a background star—a rare event that was captured for the first time by ground-based telescopes thanks to data provided by ESA's Gaia spacecraft.

A new timeline of Earth's cataclysmic past

Welcome to the early solar system. Just after the planets formed more than 4.5 billion years ago, our cosmic neighborhood was a chaotic place. Waves of comets, asteroids and even proto-planets streamed toward the inner solar ...

Black moon event bridges fiction, mythology and science

For those looking up at the sky tonight in North America, you may notice something missing—the moon! That's because July 31 marks a lunar event called the "black moon" which is the second new moon that happens in one calendar ...

Moon glows brighter than sun in images from NASA's Fermi

If our eyes could see high-energy radiation called gamma rays, the Moon would appear brighter than the Sun! That's how NASA's Fermi Gamma-ray Space Telescope has seen our neighbor in space for the past decade.

page 1 from 3

Moon

The Moon is Earth's only natural satellite and the fifth largest satellite in the Solar System. The average centre-to-centre distance from the Earth to the Moon is 384,403 km, about thirty times the diameter of the Earth. The common centre of mass of the system (the barycentre) is located about 1,700 km—a quarter the Earth's radius—beneath the surface of the Earth. The Moon makes a complete orbit around the Earth every 27.3 days (the orbital period), and the periodic variations in the geometry of the Earth–Moon–Sun system are responsible for the phases of the moon, which repeat every 29.5 days (the synodic period).

The Moon's diameter is 3,474 km, a little more than a quarter of that of the Earth. Thus, the Moon's surface area is less than a tenth that of the Earth (about a quarter the Earth's land area, approximately as large as Russia, Canada, and the United States combined), and its volume is about 2 percent that of Earth. The pull of gravity at its surface is about 17 percent of that at the Earth's surface.

The Moon is the only celestial body to which humans have traveled and upon which humans have performed a manned landing. While the Soviet Union's Luna program was the first to reach the Moon with unmanned spacecraft, the NASA Apollo program by the United States achieved the only manned missions to date, beginning with the first manned lunar mission by Apollo 8 in 1968, and six manned lunar landings between 1969 and 1972- the first being Apollo 11 in 1969. Human exploration of the Moon temporarily ceased with the conclusion of the Apollo program, although a few robotic landers and orbiters have been sent to the Moon since that time. The U.S. has committed to return to the moon by 2018.

This text uses material from Wikipedia, licensed under CC BY-SA