Quote:
Originally Posted by scc
Is 3.7 billion years too you for this system? I think I can up the age with out too many consequences, from so playing around it looks like the biggest one is that I'll have to switch two planets orbit to keep a planet habitable (It will likely be outside to habitable zone, with the change, but the planet two orbits in will now enter the habitable zone)
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Probably not. As long as you've passed the stage of massive asteroid bombardments and planets have cooled enough to form solid crusts, life can begin. Just add water and a few amino acids!