At some 4.6 billion years old, the Sun is about halfway through its life. In another 5 billion years it will be a normal "adult" star no more. Here's the skinny on the upcoming demise of the star that you owe everything to: light, warmth, energy, and life.
1. Stars like the Sun will shine for 10 to 20 billion years. But the time that a star like this spends on the so-called "main sequence," as a normal, "adult" star, lasts for some 5 billion years. In 1942 astronomers demonstrated that once a star transforms 12 percent of its hydrogen into helium, it ...
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