The Twins Of The Stars We Did Not Know !
June 16, 2017
According to a new analysis by a theoretical physicist from UC Berkeley and a radio astronomer from the Smithsonian Astrophysical Observatory at Harvard University, our Sun and all sun-like stars were born in pairs.
HOW DID THEY DISCOVER?
Recently, researchers surveyed newly formed stars in a giant molecular cloud located in the constellation Perseus. When scientists attempted to build a series of models which they thought would be in agreement with the cloud of the star. The only model that could reproduce the data was one in which all stars form initially as wide binaries. Wide binaries are stellar pairs born at least 500 astronomical units apart. An astronomical unit is the distance between Earth and the sun, roughly 93 million miles. These systems then either shrink or break apart within a million years.
HOW DOES IT HAPPEN?
Star-forming regions like the Perseus molecular cloud are littered with egg-shaped cocoons called dense cores, in which new stars are born. The latest analysis suggests that stars born of theses dense cores split far apart 60 percent of the time. The other 40 percent of the time, the egg-like cores yield closely linked binaries.
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Scientists believe that the sun’s sibling likely escaped shortly after birth. Some researchers believe the gravity of the sun’s sibling, called Nemesis, pushed an asteroid into a collision course with Earth – the asteroid that caused the extinction of the dinosaurs. The researchers have cautioned that the findings need to be checked in other star-forming clouds and that more work needs to be done to understand the physics of this phenomenon.