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Star's bulging waistline

作者:阚鸣裥    发布时间:2019-03-06 06:11:09    

By Jeff Hecht FOR the first time, astronomers have directly measured the girth of a normal star. They found that Altair, the twelfth brightest star in the sky, spins so fast that it is 14 per cent wider at its equator than from pole to pole. The researchers made the discovery by chance while using an instrument on Mount Palomar in California to observe another star. “We were using Altair as a check star for a study of Vega,

 

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