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|User Info||First earth-like planet purportedly discovered; entered at 2011-12-09 09:38:05|
Registered: 2008-05-19 Caution: Congress at Work
It is thought that the Theia impact helped to actually reduce the size of the Earth, thinning the crust and thus allowing for tectonic plate movement (and, of course, this formed the Moon).|
It's not impossible to think this could have happened here too, just that the starting and ending product were just larger. Any evidence of a satelite (at a proper distance to help rule out satelite capture) could be useful.