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Mars is the fourth planet from the Sun
in the Solar System.

The planet is named
after the Roman god of war, Mars.

It is often described
as the "Red Planet",

as the iron oxide
prevalent on its surface
gives it a reddish appearance.

Mars is a terrestrial planet
with a thin atmosphere,

having surface features reminiscent

both of the impact craters
of the Moon

and the volcanoes, valleys, deserts,
and polar ice caps of Earth.

The rotational period
and seasonal cycles of Mars

are likewise similar to those of Earth,

as is the tilt
that produces the seasons.

Mars is the site of Olympus Mons,

the highest known mountain
within the Solar System,

and of Valles Marineris,
the largest canyon.