Which statement is a CORRECT description of the expansion of the universe?
A) Spacetime is something real, with galaxies inside it; as spacetime expands, the galaxies (or superclusters of galaxies) are carried along by the expansion.
B) Space is a vacuum, but the vacuum has real properties; as galaxies (or superclusters of galaxies) hurtle outward, the expansion is gradually slowing down by the resistance of space to the passage of the galaxies.
C) Spacetime is static, but dark matter, which is concentrated in the outer part of the universe, pulls outward on the galaxies.
D) Space is a vacuum, which is really nothing at all; the galaxies (or superclusters of galaxies) are hurtling outward through this nothingness.
Correct Answer:
Verified
Q2: Which scientist discovered that the equations he
Q2: Why is the universe expanding?
A) The energy
Q4: Which description is NOT consistent with the
Q5: The expansion of the universe takes place:
A)
Q6: What causes cosmological redshift of photons that
Q8: Why did Einstein introduce his cosmological constant
Q9: Our consistent theories about the evolution of
Q10: What is the "cosmological redshift"?
A) the stretching
Q10: Einstein's general theory of relativity, as originally
Q12: Suppose an object is at rest and
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