Multiple Choice
How have astronomers measured the acceleration of the universe?
A) by comparing lookback times for white- dwarf supernovae (by measuring their apparent brightness) with the average distance between galaxies (based on their cosmological redshifts)
B) by measuring changes in galaxies' redshifts from year to year
C) They have not. It is a purely hypothetical idea.
Correct Answer:
Verified
Correct Answer:
Verified
Q103: Refer to this scenario for the following
Q104: The idea of dark matter arose to
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Q107: When we speak of the large- scale
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Q110: The distribution of the dark matter in
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Q112: When we measure the broadening of absorption
Q113: Refer to this scenario for the following