Saturday, November 26, 2011

Stars And Galaxies

Stduying Stars

By studying many stars,astronomers have found that they belong to different groups. Some are very hot and shine with bluish light, while others are much cooler and look reddish. These tints can be seen in many of the naked -eye stars that from the constellations. For example, the brightest star in the sky,Sirius,is much whiter and hotter than the Sun, while the closest known star after our Sun, Proxima Centauri, is small, dim and red, the Sun is a medium hot star.

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