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Comment by Raymond Gene Key on June 16, 2011 at 8:01pm

Thornhill: We should expect to see family traits amongst the members of the Saturnian family — including the departed Earth, Mars and Venus. For example, the moon Titan, which is larger than the planet Mercury, seems to be a close sibling of Venus, probably born from Saturn at about the same time. That Titan may be young is hinted at by its eccentric orbit, which cannot have persisted for billions of years. So we should be alert to similarities between Titan and Venus.