The figure below uses a rubber sheet as an analogy for Hubble expansion, with coins representing galaxies. The illustration demonstrates that

Question

BlackTom AI · Accepted Answer

The diagram uses a rubber sheet with coins as an analogy for cosmic expansion. This helps evaluate how distances between galaxies change as space itself stretches.
Option A: 'galaxies are repelled from each other, causing them to move away from each other.' This wording suggests a direct repulsive force between galaxies, like a push or repulsion. In the rubber-sheet analogy, there is no literal repulsive force acting between coins; instead, the fabric (space) expands and stretches distances. So this description misinterprets the mechanism behind the increasing separation.
Option B: 'galaxies may be sitting still but will move farther apart as space expands.' This aligns with the standard interpretation of cosmic expansion: galaxies are not necessarily moving through space faster; rather, the space between them expands, increasing their separations even if their local motion is minimal. The rubber sheet shows fixed coins that become farther apart as the sheet stretches, which matches this statement.
Option C: 'galaxies are being flung outward by the Big Bang.' While the Big Bang marks the origin of expansion, the ongoing separation is not described as galaxies being flung outward from a center; rather, space itself expands and distances increase uniformly (on large scales). This wording implies a mechanical ejection rather than metric expansion.
Option D: 'space is expanding in two dimensions only.' The analogy and cosmological expansion apply to three spatial dimensions (and time), not just two. Limiting expansion to two dimensions contradicts the actual concept and the 3D nature of the universe.
Option E: 'galaxies stand still, and distances are unchanged by the expanding universe.' This directly contradicts the observed and modeled expansion: distances between galaxies increase over time due to space itself expanding, so distances are not unchanged.
In summary, the most accurate description given the rubber-sheet analogy is that galaxies may be effectively stationary locally but will get farther apart because space itself is expanding. The other options introduce incorrect mechanisms, dimensionality, or mischaracterize the Big Bang process.

The figure below uses a rubber sheet as an analogy for Hubble expansion, with coins representing galaxies. The illustration demonstrates that Single choice

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