The cosmological principle states that any observer in any galaxy sees the same general properties for the Universe.
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Q10: The Hubble time is_.
A) an estimate of
Q11: The "big bang" was an explosion of
Q12: The expansion of the Universe is accelerating.
Q13: All dark matter in our Universe falls
Q14: Normal matter is baryonic.
Q16: Olber's paradox states that the _.
A) Universe
Q17: The cosmological redshifts of galaxies are Doppler
Q18: After nuclear reactions in the big bang
Q19: The Universe is isotropic, but not homogenous.
Q20: Cosmologists cannot begin their history of the
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