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Mars

Distance from Sun: 142,000,000 miles

Diameter: 4,194 miles or about half the diameter of Earth

Number of moons: 2

Length of year: 687 Earth days

Temperature: -266°F to -62°F

Mars is mainly made of rock, with a metallic core.

Mars is the fourth planet from the Sun, and is about half as big as Earth. Mars is covered with red rocks, and has white ice caps at the poles. There are huge volcanoes and lots of craters on the surface. Some scientists think they may have found evidence that primitive life forms existed on Mars long ago. There is no life known to exist on Mars today.

The source of this material is Windows to the Universe, at http://www.windows.ucar.edu/ at the University Corporation for Atmospheric Research (UCAR). ©1995-1999, 2000 The Regents of the University of Michigan; ©2000-04 University Corporation for Atmospheric Research. All Rights Reserved. Site policies and disclaimer