Astronomers have found a twin star to Earth's own sun, only much older. The rare star is the oldest known "solar twin," and offers a peek at what Earth's star will look like in 4 billion years.
Astronomers have found a twin star to Earth's own sun, only much older. The rare star is the oldest known "solar twin," and offers a peek at what Earth's star will look like in 4 billion years.
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