It was the study of this planet's orbit that [[Albert Einstein]] used to help confirm the theory of General Relativity.<ref>Testing general relativity [http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=31277 European Space Agency] Accessed July 16 2007</ref><ref>Albert Einstein [http://www.phy.hr/ Fizički odsjek] Accessed July 16 2007</ref>
It was the study of this planet's orbit that [[Albert Einstein]] used to help confirm the theory of General Relativity.<ref>Testing general relativity [http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=31277 European Space Agency] Accessed July 16 2007</ref><ref>Albert Einstein [http://www.phy.hr/ Fizički odsjek] Accessed July 16 2007</ref>
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Mercury has more or less no atmosphere, and many craters. <ref>John Gribbin, ''Companion to the Cosmos'' (Little, Brown & Company, 1996)</ref>