A new study challenges the existence of dark matter, proposing that gravity can arise from 'topological defects' in spacetime.
According to the theory of general relativity, a galaxy must have a certain amount of mass to be held together by gravity. However, scientists don’t see enough visible mass in many galaxies in the universe, yet gravity keeps such galaxies intact. How’s this even possible?
For decades, this explanation has supported the existence of the hypothetical dark matter. However, a new study claims that gravity can exist even without mass, potentially eliminating the need for dark matter altogether. To this date, whenever gravitational bending is observed in the case of a galaxy or galactic clusters, but there is no visible mass — scientists simply assume that it is the invisible dark matter that caused the bending.
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