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Stars: always making a dramatic exit! 🌟

Webb’s powerful infrared eye has captured never-before-seen detail of Cassiopeia A (Cas A). 11,000 light-years away, it is the remnant of a massive star that exploded about 340 years ago: https://go.nasa.gov/3ZJnk72
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Webb Reveals Never-Before-Seen Details in Cassiopeia A

A new mid-infrared image from NASA’s James Webb Space Telescope shows the supernova remnant Cassiopeia A (Cas A), created by a stellar explosion 340 years ago. Cas A is the youngest known remnant from an exploding, massive star in our galaxy.
Isabelle Yan (NASA)
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in reply to NASA

David Phillips
David Phillips
• •
I am not sure if I understand. If it exploded 340 years ago, and is 11K light years away, how can we see it?

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