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Mars

Mars, featuring Valles Marineris running east-west across the globe, and the Tharsis bulge at top left, site of Mars's greatest...Read More >>Mars, featuring Valles Marineris running east-west across the globe, and the Tharsis bulge at top left, site of Mars's greatest volcanoes. Mars is the fourth planet from the Sun. A barren planet, its reddish colour comes from iron oxide dust (familiar to us as rust). Immense storms occasionally blow up, blanketing the entire planet with dust. Large dark patches that appear from time to time are areas of rock exposed when storms remove the dust. Mars is known as the “Red Planet”, but not all of it is red. Both poles are white: they have caps of water ice and carbon dioxide ice.



Image of Mount Sharp on the Martian surface, taken by NASA's Curiosity rover in September 2015.
This crater on Mars contains water ice.

Similarities with Earth

Mars has a number of features in common with our planet Earth. On Mars there are volcanoes, mountains, dried-up river beds, canyons, deserts and polar ice caps. The Martian day is only a little longer than ours, and the angle of tilt means that Mars has four seasons, just as on Earth. Although average temperatures are a lot colder than on Earth, daytime temperatures at the equator can sometimes reach 35°C (95°F) in midsummer. Thin clouds of water vapour or early morning surface frosts can also sometimes be seen.
 

Phobos, one of the Martian moons, will collide with Mars in about 50 million years' time.

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