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Puppis A

Puppis A is a supernova remnant about 100 light-years in diameter and roughly 6500–7000 light-years distant. Its apparent angular diameter is about 1 degree. The light of the supernova explosion reached Earth approximately 3700 years ago. Although... Wikipedia
Distance: 7,000 ly
Galactic coordinates: l = 260.2°, b = -3.7°