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Revelations of stars' ages will be a boon for SETI

作者:江坏鳖    发布时间:2019-03-07 09:09:10    

IN THE sky, as in Hollywood, stars rarely reveal their age. Yet knowing the age of the cosmic variety is particularly important, as it determines whether a star’s planets are old enough for intelligent life to have evolved on them. Now NASA’s Kepler space telescope has taken a huge step towards measuring the ages of 500 sun-like stars. Such stars vibrate at frequencies that depend on their internal structure, which changes as they age. This means it should be possible to estimate a star’s age based on the way it vibrates. However, vibrations, seen as tiny,

 

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