via nasa.gov
About 3,700 years ago people on Earth would have seen a brand-new bright star in the sky. As it slowly dimmed out of sight, it was eventually forgotten, until modern astronomers found its remains -- called Puppis A. Seen as a red dusty cloud in this image from NASA's Wide-field Infrared Survey Explorer, or WISE, Puppis A is the remnant of a supernova explosion.
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