Sunday, 27 November 2011


Mercury is the closest planet to the Sun and the smallest planet in the Solar System 
(0.055 Earth masses). Mercury has no natural satellites, and its only known geological 
features besides impact craters are lobed ridges or rupees, probably produced by a period of
 contraction early in its history. Mercury's almost negligible atmosphere consists of atoms 
blasted off its surface by the solar wind. Its relatively large iron core and thin mantle have not 
yet been adequately explained. Hypotheses include that its outer layers were stripped
off by a giant impact, and that it was prevented from fully accreting by the young Sun's 

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