"We are saying, yes, there probably was

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SAN FRANCISCO, June 17 (Xinhua) -- A new analysis indicates that our sun almost certain had a twin, though not an identical one, when it was born 4.5 billion years ago.

Actually, the analysis by a theoretical physicist from the University of California, Berkeley, and a radio astronomer from the Smithsonian Astrophysical Observatory at Harvard University provides new evidence that all stars are born in pairs.

The new assertion is based on a radio survey of a giant molecular cloud filled with recently formed stars in the constellation Perseus Men's Nike Air VaporMax 2.0 Racer Blue Red , and a mathematical model that can explain the Perseus observations only if all sunlike stars are born with a companion.

Many stars have companions, including our nearest neighbor, Alpha Centauri, a triplet system. Astronomers have long sought an explanation.

Astonomers have searched for a companion to our sun, a star dubbed Nemesis because it was supposed to have kicked an asteroid into Earth's orbit that collided with our planet and exterminated the dinosaurs. It has never been found.

"We are saying, yes, there probably was a Nemesis, a long time ago." noted Steven Stahler Nike Air Vapormax CS Triple Black Men's , a University of California, Berkeley, research astronomer and co-author of a paper already accepted for publication in the Monthly Notices of the Royal Astronomical Society.

"We ran a series of statistical models to see if we could account for the relative populations of young single stars and binaries of all separations in the Perseus molecular cloud, and the only model that could reproduce the data was one in which all stars form initially as wide binaries. These systems then either shrink or break apart within a million years," said Stahler.

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