the eighth largest. Mercury has been now been visited by two spacecraft, Mariner 10 and MESSENGER Temperature variations on Mercury are the most extreme in the solar system ranging from 90 K to 700 K. Mercury is in many ways similar to the Moon: its surface is heavily cratered and very old In addition to the heavily cratered terrain, Mercury also has regions of relatively smooth plains. Some may be the result of ancient volcanic activity but some may be the result of the deposition of ejecta from…
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