Is there gravity on the moon?

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** Is there gravity on the moon? **

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Source: answers.yahoo.com/question/index?qid=20060731102115AAqHsaA


Gravitation of the Moon - Wikipedia, the free encyclopedia

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** Gravitation of the Moon **

From Wikipedia, the free encyclopedia
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Radial gravity anomaly at the surface of the Moon in Gal (acceleration)

The *gravitational field of the Moon* has been determined by the tracking
of radio signals emitted by orbiting spacecraft. The principle used depends
on the Doppler effect, whereby the line-of-sight spacecraft acceleration
can be measured by small shifts in frequency of the radio signal, and the
measurement of the distance from the spacecraft to a station on Earth.
Since the gravitational field of the Moon affects the orbit of a
spacecraft, it is possible to use these tracking data to invert for gravity
anomalies. However, because of the Moon's synchronous rotation it is not
possible to track spacecraft much over the limbs of the Moon, and the
far-side gravity field is thus only poorly characterized. The acceleration
due to gravity on the surface of the Moon is 1.6249 m/s^2, about 16.6%
that on Earth's surface.^[1] Over the entire surface, the variation in
gravitational acceleration is about 0.0253 m/s^2 (1.6% of the acceleration
due to gravity). Because weight is directly dependent upon gravitational
acceleration, things on the Moon will weigh only 16.6% of what they weigh
on the Earth.

Gravity acceleration at the surface of the Moon in m/s^2. Near side on the
left, far side on the right. Map from Lunar Gravity Model 2011.

The major characteristic of the Moon's gravitational field is the presence
of mascons, which are large positive gravity anomalies associated with some
of the giant impact basins. These anomalies greatly influence the orbit of
spacecraft about the Moon, and an accurate gravitational model is necessary
in the planning of both manned and unmanned missions. They


Source: en.wikipedia.org/wiki/Gravitation_of_the_Moon

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