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Thor's Helmet

  1. Jun 17, 2009 #1
    I read that Thor's helmet (NGC 2359) is in a pre-supernova stage, but there is an emissions nebula around it. How this possible if the star is hasn't gone supernova?
  2. jcsd
  3. Jun 17, 2009 #2


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    Don't know the specific object but giant stars lose their outer envelopes in the late stages of evolution.
  4. Jun 17, 2009 #3


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    Right. See Eta Carinae as an example of just such a pre-nova star.
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