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New Evidence Suggests that ALL Sun-like Stars are Born as Binaries

06/16/2017 01:39PM

New Evidence Suggests that ALL Sun-like Stars are Born as Binaries

Did our Sun have a twin when it was born 4.5 billion years ago? Almost certainly yes -- though not an identical twin... And so did every other Sun-like star in the Universe, according to a new study. Many stars have gravitationally bound companions, including our nearest neighbor, Alpha Centauri, a triplet system. Astronomers have long sought an explanation -- Are binary and triplet star systems born that way? Did one star capture the other? Do binary stars sometimes split up and become single stars? The new study, based on a radio survey of a giant molecular cloud in the constellation Perseus and a mathematical model that can explain the Perseus observations only if all Sun-like stars are born with a companion, suggest that Yes -- all Sun-like stars in the Universe start life as binaries.


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