13.2bn-year-old star most ancient in the universe
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LONDON: Scientists have identified a star, at least 13.2
billion-years-old, as the oldest yet seen in the universe and it is just
186 light years away from Earth.
The Big Bang is calculated by scientists to have taken place about 13.77 billion years ago and the star, known as HD 140283, was among the earliest stars to form, the 'Daily Mail' reported.
"We believe this star is the oldest known in the Universe with a well determined age," Howard Bond, an astronomer at Pennsylvania State University, told the American Astronomical Society.
Since it contains some heavy elements it is thought to have been one of the second generation of stars to be created following the Big Bang. The first generation of stars contained hardly any elements heavier than helium but when they exploded in a succession of supernovas within a few hundred million years after forming they were replaced by stars like HD 140283.
Observations from the Hubble Telescope helped experts fix the distance of the star from the Earth with unprecedented accuracy which allowed them to make more accurate measurements of how brightly it shines. Once its brightness was established they were able to work out how rapidly its hydrogen is being exhausted and so determine its age.
The Big Bang is calculated by scientists to have taken place about 13.77 billion years ago and the star, known as HD 140283, was among the earliest stars to form, the 'Daily Mail' reported.
"We believe this star is the oldest known in the Universe with a well determined age," Howard Bond, an astronomer at Pennsylvania State University, told the American Astronomical Society.
Since it contains some heavy elements it is thought to have been one of the second generation of stars to be created following the Big Bang. The first generation of stars contained hardly any elements heavier than helium but when they exploded in a succession of supernovas within a few hundred million years after forming they were replaced by stars like HD 140283.
Observations from the Hubble Telescope helped experts fix the distance of the star from the Earth with unprecedented accuracy which allowed them to make more accurate measurements of how brightly it shines. Once its brightness was established they were able to work out how rapidly its hydrogen is being exhausted and so determine its age.
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