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Mar 19 at 3:25 comment added Astrovis Do you mean the hydrogen-fusing shell of the star after the outer envelope has been blown off as a planetary nebula?
Aug 24, 2021 at 12:00 history tweeted twitter.com/StackAstronomy/status/1430137833843482624
Aug 24, 2021 at 7:57 comment added PM 2Ring en.wikipedia.org/wiki/Planetary_nebula may be helpful.
Aug 24, 2021 at 7:18 comment added Dave My question was not as clear as I thought it was : During the short moment when the outer layers of a star are thrown into outer space, can we get a gamma ray burst from the very last nuclear fusions that occured inside the core? I know that white dwarfs are not hot enough to radiate with such energy, I just need to know if such rays can escape right after the star's death.
Aug 24, 2021 at 1:22 history became hot network question
Aug 24, 2021 at 0:47 comment added PM 2Ring BTW, Earth will be uninhabitable long before the Sun's red giant phase. From en.wikipedia.org/wiki/… In 2.8 billion years, "Earth's surface temperature will reach around 420 K (147 °C; 296 °F), even at the poles". But conditions for life will be very bad by half a billion years or so.
Aug 23, 2021 at 18:23 answer added James K timeline score: 5
Aug 23, 2021 at 17:31 review First posts
Aug 24, 2021 at 13:31
Aug 23, 2021 at 17:21 history asked Dave CC BY-SA 4.0