Type II supernovae have little hydrogen in their spectra; it had been used up already.
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Q11: Novae are more closely related to Type
Q12: Iron is the most stably bonded atomic
Q13: A carbon-detonation supernova starts out as a
Q14: The spectra of the youngest stars show
Q15: Unlike supernovae, novae can explode more than
Q17: Except for hydrogen and most of the
Q18: Because they all involve the detonation of
Q19: Most of the energy released during a
Q20: A massive star can fuse only up
Q21: For a nova to occur, the system
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