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### Theory:

Mars is the fourth planet and the second-smallest planet in the solar system. It is the first planet lying outside the orbit of the Earth from the Sun. The planet completes its rotation in $$24.62\ hours$$, and the period of revolution is $$687\ days$$.

Mars

Red planet:
Mars is generally called the 'Red planet' as it appears slightly reddish in colour. This colour is due to the iron oxide, which is present on its surface.

Surface of Mars

Natural satellites:
Mars has two natural satellites, namely Phobos and Deimos, out of which Deimos is smaller.

Phobos and Deimos orbiting Mars

Astronomers have sent many unmanned spacecraft to Mars to study its surface, climate, and geology.
Asteroid belt:
Asteroids are small rocky celestial objects that orbit in space. These asteroids form a belt-like structure between Mars and Jupiter. This asteroid belt looks like a dividing line between the inner rocky planets and the outer gaseous giants.

The asteroid belt between Mars and Jupiter
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