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‘Once-in-a-lifetime’ explosion will bring a new star to the night sky
(edition.cnn.com)
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this post was submitted on 12 Jun 2024
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This is saying good morning to everyone at midnight levels of pedantic. Astronomers need a common reference frame for discussing timing, and the reference frame they use is "when it's observed at Earth".
Because nothing else allows for coherent organization, discussion, or education.
A nuclear fusion event occurred in the accretion disk of a stellar remnant 2600 years ago or so. An astronomical event known as a nova will occur in the sky sometime this summer.