Talk:AG Carinae

NOT a Planetary Nebula
Looking at the SIMBAD entry for the star, I noticed a note about it being misclassified as a PN. The abstract for the Hubble observation of the object calls it a circumstellar shell. I didn't know if I should change it because I am not an astronomer and easily confused by these things. I do read a bit about these things when I process the images, though. Geckzilla (talk) 21:59, 4 September 2013 (UTC)
 * You're correct about it not being a planetary nebula - that refers to a specific type of emission nebula formed by stars of no more than about 8 solar masses during their post-AGB evolution. At ~70 solar masses, there is no way the ejecta nebula around this star is a PN, even if it does (superficially) resemble one in some ways. 203.57.209.105 (talk) 16:14, 30 October 2014 (UTC)

10,000 years ago or 20,000 light years away?
Recent coverage of the Hubble Observatory's picture of the star (e.g. SciTechDaily) talks about "One or more giant eruptions 10,000 years ago created the beautiful, expanding shell of dust and gas seen here." Hold on, if it's 20,000 light years away, then we can't see this she'll, the light hasn't arrived yet!?

This Wikipedia article similarly says "The nebula contains around 15 M☉, all lost from the star around 10,000 years ago." Are we going to see this nebula when the light arrives at Earth in another 10,000 years, or did it happen 10,000 years before the photons showing the ring that we currently see on Earth were emitted?

Maybe relative time is handled a certain way in astronomical discussions, and this is just the first time I've noticed the issue with "NNNNN years ago"? -- Skierpage (talk) 06:14, 25 April 2021 (UTC)

Featured picture scheduled for POTD
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