Stratosphere Messages 373 Reaction score 0 Thread starter 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?
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?
mgb_phys Science Advisor Homework Helper Messages 7,906 Reaction score 15 Jun 17, 2009 #2 Don't know the specific object but giant stars lose their outer envelopes in the late stages of evolution.
Don't know the specific object but giant stars lose their outer envelopes in the late stages of evolution.
negitron Science Advisor Messages 848 Reaction score 2 Jun 17, 2009 #3 mgb_phys said: Don't know the specific object but giant stars lose their outer envelopes in the late stages of evolution. Right. See Eta Carinae as an example of just such a pre-nova star.
mgb_phys said: Don't know the specific object but giant stars lose their outer envelopes in the late stages of evolution. Right. See Eta Carinae as an example of just such a pre-nova star.