Which of these statements 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.

Question

Quizplus · Accepted Answer

The correct description of the expansion of the universe involves the concept that spacetime is a real, physical entity that is expanding, and galaxies or superclusters of galaxies are carried along with this expansion. This view aligns with the modern understanding of cosmology, where the fabric of spacetime itself is expanding since the Big Bang, and it is not merely galaxies moving through a static space.

Which of These Statements Is a Correct Description of the Expansion