What ionizes the gas in a planetary nebula and makes it visible?
A) X-ray photons emitted by a pulsar
B) ultraviolet photons emitted by a white dwarf
C) the shock wave from a supernova
D) hydrogen burning in the nebular gas
E) infrared photons from a nova explosion
Correct Answer:
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Q45: A star like the Sun will eventually
Q46: Asymptotic giant branch stars have high mass-loss
Q47: In a white dwarf, what is the
Q48: Asymptotic giant branch stars have _ luminosities,
Q49: A star like the Sun will lose
Q51: You observe a 0.8 MSUN white dwarf
Q52: Even while the Sun is still on
Q53: One star in a binary will almost
Q54: As a white dwarf star gradually cools,
Q55: The Sun eventually will become a
A) nova.
B)
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