Which Statement Is a CORRECT Description of the Expansion of the Universe

question 102

Multiple Choice

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.