Is our galaxy trapped in an empty void?
Scientists from Germany, Scotland, and the Czech Republic propose that our galaxy may be situated in a region of space with relatively little matter, resembling an "air bubble in a cake." This hypothesis arises from discrepancies in the Hubble-Lemaitre constant, which measures the distance and speed at which galaxies move away from each other. The researchers suggest that a local "under-density" or void in the universe could explain these deviations, challenging the standard model of cosmology. They propose a modified theory of gravity called "modified Newtonian dynamics" (MOND) to account for the existence of such bubbles. If true, this theory would resolve the Hubble tension and potentially reshape our understanding of the universe's expansion.
