Astronomers have found one of the oldest known stars. And it's old: 13.2 billion years old. The Sun, by comparison, is 4.6 billion years old. A veritable baby! Dating a star is hard (in both senses of both words), but there are telltale signs of age. One thing you can do is look for stars that are almost entirely hydrogen and helium, and there's a good chance they'll be really old. In the early Universe, those two elements were pretty much all there was. When the first generation of stars formed, they created heavier elements like carbon, oxygen, and even much heavier elements like iron and so on up the periodic table. When they exploded they scattered those heavy elements around them, which eventually became part of dust and gas clouds which formed the next generation of stars. So younger stars tend to have more heavy elements than older stars. ...
Star found, older than Abe Vigoda
Discover the oldest known stars and their secrets, revealing their age of 13.2 billion years and ties to the universe's first generations.
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