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Astronomy

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    $\begingroup$ By "stellar remnant", do you mean a white dwarf, a neutron star or a black hole? You might like to look them up (e.g. on Wikipedia) to see how utterly unlike a planet they each are, whether in composition, density or the nature of the degeneracy of the core. You might do best to focus on white dwarfs, as neutron stars and black holes aren't composed of "elements". $\endgroup$
    – Chappo Hasn't Forgotten
    Commented Feb 7, 2019 at 6:36
  • $\begingroup$ This may be a good question if you don't know anything about stellar remnants. Therefore I upvote. But still, the prior research suggested by Chappo would be welcome. $\endgroup$
    – AtmosphericPrisonEscape
    Commented Feb 7, 2019 at 10:33
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    $\begingroup$ "a stellar remnant lower in mass than all of those". There's no such animal. Small stars eventually turn into white dwarfs. At least, we think they do, the universe isn't old enough yet for us to see what happens to red dwarfs when they stop doing fusion. Those things probably burn for a trillion years or more. And white dwarfs take like 50 billion years to cool down. $\endgroup$
    – PM 2Ring
    Commented Feb 7, 2019 at 14:57
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    $\begingroup$ A neutron-degenerate remnant, aka a neutron star, remains after a star explodes, scattering all sorts of goodies into the interstellar medium. There are several different types of supernova, the Wikipedia article is a good comprehensive introduction to the topic. $\endgroup$
    – PM 2Ring
    Commented Feb 7, 2019 at 15:02
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    $\begingroup$ I recommend you take a look at Rob Jeffries' excellent answer to astronomy.stackexchange.com/questions/16311/… $\endgroup$
    – PM 2Ring
    Commented Feb 7, 2019 at 15:42