Suppose you want to know the distance to a particular galaxy. What's the biggest problem with using type Ia supernovae to measure the distance?
A) Supernovae are extremely luminous and can outshine their galaxies.
B) Supernovae all have about the same luminosity.
C) Because supernovae are very energetic, they are not well understood.
D) Supernovae are rare, so you might have to wait a long time.
Correct Answer:
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