Earth is the only planet in the solar system that is life.
Earth's spherical shape and a diameter of 12,750 km. distance of the Earth to
the Sun approximately 150 million km and about 2/3 of the surface area of the
Earth is covered by oceans. Earth has a layer of air or atmosphere. The content
of the atmosphere consists of gases, namely oxygen (acidity) and nitrogen
(nitrogen). Another type of gas is not so large volume. The atmosphere is
useful to protect the earth from harmful solar radiation and celestial objects
are attracted by the force of gravity. With the layer of the atmosphere, the
temperature of the earth at night was not too cold. Earth has one satellite
that month.
Mars is easy to spot, because the planet appears reddish.
The center line of march of about 6780 km. mars with sun distance of
approximately 228 million km. time spent on mars for once around the sun for
687 days. As well as venus, mars surface too dry. Mars has a thin layer of
atmosphere. Temperature on Mars is not very high, at 30 degrees C during the
day and at night -70 degrees C. Mars has two satellites, namely Demos and
Fobos.
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