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Partial lunar eclipse to grace U.K. evening sky

Tuesday, 16 July, will see a partial eclipse of the moon, visible in the U.K. after sunset. The eclipse, 50 years to the day after the launch of Apollo 11, will also be seen across a large part of Asia, the whole of Africa, ...

Mapping the moon for Apollo

At an International Astronomical Union meeting in 1955, noted astronomer Gerard Kuiper asked for suggestions and collaborators on a project to make a map of the moon. At the time, the best lunar atlases had hand-drawn images, ...

Moon dust is not to be sneezed at

When the astronauts of the Apollo 11 mission returned to Earth, they had almost 22 kilograms of rock from the surface of the moon in their baggage. Josef Zähringer from the Max Planck Institute for Nuclear Physics in Heidelberg ...

Image: Earth and an eclipsed moon

SMART-1, ESA's first mission to the moon, captured this series of unique images of our home planet Earth and the moon during a total lunar eclipse.

India scrubs Moon mission launch one hour before liftoff

India on Monday postponed the launch of a lunar probe less than an hour before blast-off because of a technical problem, delaying its bid to become only the fourth nation to land a spacecraft on the Moon.

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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.

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