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November 4, 2013 01:50 pm PST
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/DfZjJZH8XEA/story01.htm
"Impossible world"observed
This rocky world, 700 light years away, might have been another Earth. Twenty percent wider, with not quite twice the mass, its density is almost the same.Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/DfZjJZH8XEA/story01.htm
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