SEE THAT RED STAR? IT MIGHT ALREADY BE DEAD. Betelgeuse. The red supergiant marking Orion's left shoulder. One of the brightest stars in the night sky. And it could have already exploded. Right now, Betelgeuse is 642 light-years away. That means the light you see tonight left the star 642 years ago, in 1384. If Betelgeuse exploded 500 years ago, we would not know yet. The light from the supernova is still traveling toward us. It could arrive tomorrow. It could arrive in 100,000 years. We have no
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