At what speed does the room expand
Is the universe expanding at the same speed everywhere in the universe?
We cannot say what lies outside the observable universe, but averaged over sufficiently large scales (≳ one billion light years) it does seem to expand evenly.
However, the presence of mass or general energy retards expansion. This means that on the scale of galaxy clusters, the universe expands more slowly, and on the scale of galaxy groups, the mutual attraction of the galaxies prevents them from receding from one another. This is also why our galaxy, solar system, planet and bikes are never torn apart (unless the cosmological constant is not a constant).
Conversely, at mass subdensities, ie the large voids between clusters and filaments of gas and galaxies, the expansion is increased (relative to denser regions). In fact, it has been assumed that the observed accelerated expansion of the universe is not due to dark energy, but could be an "illusion" if one accidentally lives in the center of a huge underdensity (e.g. Zibin et al. 2008). However, recent observations seem to rule out this possibility
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