The Moon

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The Moon is the only natural satellite
of the Earth. It has a radius of 1,738
km.

The Moon orbits the Earth. At the
same time, the Earth moves around
the Sun. Because of both movements, it takes the Moon just
over 29 days to return to its original
position.

We can see the Moon because of light from the sun, which always comes from the same direction.
Because the position of the Moon
changes in relation to the Earth,
we see greater or lesser parts of
the Moon as it travels around the
Earth.

What we see is known as the phases
of the Moon,Full Moon, and it is always the same half.
This is because the Moon rotates,
or spins, around its own axis as it
moves through space.
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The topic taken from:
English Course For Yemen
Pupil's Book 6
Page  73.
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