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What is the current best determination of the Hubble constant?
Q11: When two galaxies collide,they pass through each
Q27: What is the difference between a population
Q32: The values below pertain to a
Q33: Flow channels on Venus suggest it was
Q38: If spiral density waves were the only
Q40: Refer to the figure.If you observe the
Q55: What was the temperature of the universe
Q83: Electrons moving in a strong magnetic field
Q101: How do absorption lines from interstellar gas
Q110: How can we be certain that white