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Venus only slightly closer to sun, so expect about
same initial composition
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Venus only slightly smaller than Earth, so expect
about same heat flow
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Venus atmosphere is dramatically different
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Very thick CO2 atmosphere
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Virtually no water in atmosphere or on surface
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Venus shows relatively recent volcanic activity, but no plate
tectonics
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Both probably related to its slightly closer position
to the sun
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which caused loss of its critical water
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Thick
atmosphere and clouds block direct view so information from:
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Orbiting
radar missions (Magellan in early
90s)
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Russian
landers (as in previous photo)
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