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the moon


									The moon is the only natural satellite of Earth, and is the largest
natural satellite in the Solar System 5. The moon does not have its own
light source and the light actually comes from the Moon reflected light
of the Sun.

The average distance from the Earth-Moon center to center is 384 403 km,
about 30 times the diameter of Earth. Diameter of the Moon is 3474 km,
[1] is slightly smaller than a quarter the diameter of Earth. This means
that the volume of the Moon is only about 2 percent by volume of Earth
and its gravitational pull on its surface about 17 percent rather than
the Earth's gravitational pull. The moon revolves around Earth once every
27.3 days (orbital period), and periodic variations in the Earth-Moon
system, the Sun is responsible for the occurrence of the phases of the
Moon is repeated every 29.5 days (period sinodic).

The density of the Moon (3.4 g / cm ³) is lighter than the density of the
Earth (5.5 g / cm ³), while the mass of the Moon is only 0.012 Earth

Months drawn by the force of gravity does not fall to the Earth caused by
the centrifugal force arising from the Moon's orbit around the Earth. The
amount of centrifugal force the Moon is slightly larger than the
gravitational attractive forces between the Earth and Moon. This causes
the Moon farther away from Earth at about 3.8 cm / year.

The moon is in synchronous orbit with the Earth, this led to only one
side of the Moon's surface that can be observed from Earth. Synchronous
orbit with the same rotation causes kala kala revolution.

In the month there is no air or water. Terhasil many craters on the lunar
surface is caused by a comet or asteroid hit. The absence of air and
water on the moon cause the absence of erosion that causes a lot of
craters on the moon millions of years old and still intact. Among the
biggest is the Clavius ??crater with a diameter of 230 kilometers and as
deep as 3.6 kilometers. A lack of air also causes no sound can be heard
on the Moon.

The moon is the only thing that ever visited the sky and landed humans.
The first artificial object to pass near the Moon was the Soviet Union's
spacecraft, Luna 1, the first artificial object to hit the lunar surface
was Luna 2, and the first photograph the far side is never visible from
Earth, taken by Luna 3, all of the mission carried out in of 1959. The
first spacecraft to successfully perform the landing was Luna 9, and who
successfully orbited the Moon was Luna 10, both made in 1966. [1] Apollo
Program of the United States is the only manned missions to date, which
made six manned landings between 1969 and 1972.

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