CAMBRIDGE, Mass. — Nearly 13.7 billion years ago, the universe was made of only hydrogen, helium and traces of lithium — byproducts of the Big Bang. Some 300 million years later, the very first stars ...
When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Light from three ancient stars at the edge of the Milky Way indicates that the stars contain ...
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