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A Solar System Coloring Book Courtesy of the Windows to the Universe Projecthttp://www.windows.ucar.edu 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; 2000-01 University Corporation for Atmospheric Research. All Rights Reserved. The Sun The Sun is a star at the center of our solar system. It gives off light and heat. The Sun is bigger than any of the planets. The Sun looks yellow from Earth.Never look directly at the Sun, because it will hurt your eyes! Size: The Sun is wider than 100 Earths.Temperature: ~27,000,000 F in the center, ~10,000 F at the surface. So, that’s REALLY hot anywhere on the Sun!The Sun is made up of gas. 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; 2000-01 University Corporation for Atmospheric Research. All Rights Reserved. Mercury Mercury is a ball of rock.Mercury is the planet closest to the Sun. Its grey surface is covered with craters.