(As opposed to Neal Stephenson's Seveneves which, sorry Neal, I didn't like that much). The Trappist system is now up to seven "earth-like" planets - by which we mean rockballs about the same size as Earth, not necessarily habitable. Although several are in the habitable zone.
One has to wonder how different the development of a species would be if there were other habitable planets in the same system. Or better yet, inhabited...
How would we react to Mars if the canals had been real?
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