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Moon

The Moon is Earth's only natural satellite.

The average distance from the Earth to the Moon is 384,399 kilometres (238,854 mi), which is about 30 times the diameter of the Earth.

At this distance, it takes sunlight reflected from the lunar surface approximately 1.3 seconds to reach Earth.

The Moon's diameter is 3,474 kilometres (2,159 mi), which is about 3.7 times smaller than the Earth, making it the Solar System's fifth largest moon, both by diameter and mass, ranking behind Ganymede, Titan, Callisto, and Io.

Note: This article excerpts material from the Wikipedia article "Moon", which is released under the GNU Free Documentation License.

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last updated on 2014-04-20 at 8:13 am EDT

Space Research Hotline to the Moon

Space Research Hotline to the Moon

Deutsche Welle (Jan. 7, 2013) Despite funding being scarce, Europe still has grand plans to make it to the Moon and Mars. The first goal is to build an outpost on the Moon to facilitate further trips into space. But such a station would have to be contactable at all times. Space researchers in Stuttgart are working out how to set up a sustained radio connection. They hope to position communication satellites at a spot between the Moon and the Earth where the gravitational forces of the two celestial bodies balance out.
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Manned Mission to Mars? Hedgehogs May Go First

Manned Mission to Mars? Hedgehogs May Go First

Reuters (Feb. 27, 2013) American entrepreneur, Dennis Tito, says he wants to launch a manned mission to Mars in January 2018, but researchers at NASA and Stanford University argue that it may be better to visit the mysterious Martian moon, Phobos first. They're developing a team of robots they call "hedgehogs" to explore Phobos in the belief that a trip to the Martian moon will make a subsequent mission to Mars safer and more productive.
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What's Up for October 2013

What's Up for October 2013

NASA (Sep. 30, 2013) Jane Houston Jones: What's Up for October. Juno's Earth flyby, International Observe the Moon Night and how to view the moon's far side. Hello and welcome. I'm Jane Houston Jones from NASA's Jet Propulsion Laboratory in Pasadena, California. Jones: On October 9 at 3:21 p.m. Eastern time, or 19:21 Universal Coordinated Time, NASA's Juno spacecraft performs a close flyby of Earth. At closest approach, Juno will come to within 347 miles or 559 kilometers of our planet's surface.
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Scientists Present Moon Rotation in Full Lunar Glory

Scientists Present Moon Rotation in Full Lunar Glory

Reuters (Sep. 19, 2013) Using data captured by a NASA satellite in orbit around the moon, scientists have created a stunning movie mosaic showing a full rotation of the moon recorded over a lunar month. Rob Muir reports.
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