Mercury is one of Earth’s cosmic neighbors, regularly approaching to within 80 million km (50 million mi)—closer than any planet other than Venus and Mars. At such times, it becomes a tiny beacon that rivals Sirus, the brightest star in the sky. Yet although the existence of this elusive little planet has been recognized since prehistoric times, it remains one of the most mysterious inhabitants of our Solar System.
KeywordsSolar Wind Radio Telescope Impact Crater Secondary Crater Impact Basin
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