Puppis A

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Puppis A (Pup A) is a supernova remnant (SNR) about 100 light-years in diameter and roughly 6,500–7,000 light-years distant. Its apparent angular diameter is about 1 degree. The light of the supernova explosion reached Earth approximately 3,700 years ago.

Excerpt from the Wikipedia article “Puppis A”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Chandra: NASA/CXC/GSFC/U.Hwang et al.; ROSAT: NASA/GSFC/S.Snowden et al., Public domain, via Wikimedia Commons.