Nearly 900 years ago, astronomers spotted a strange, bright light in the sky. We finally know what caused it.
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In the 12th century, Chinese and Japanese astronomers spotted a supernova in the sky shining as brightly as Saturn.Nearly 900 years ago, astronomers spotted a strange, bright light in the sky. We finally know what caused it.
In the 12th century, Chinese and Japanese astronomers spotted a supernova in the sky shining as brightly as Saturn. Read more