Mars
The fourth planet from the Sun, which can approach *Earth to within 54.7 million km. It is much smaller than Venus or Earth, with a mass 0.11 that of Earth. It has a surface pressure less than 1% that of Earth at sea level, and surface temperatures ranging from –100 oC to 0 oC. Mars is slightly pear-shaped, with a low, level northern hemisphere, which is comparatively uncratered and geologically ‘young’, and a heavily cratered ‘ancient’ southern hemisphere.... ...
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