If the galaxies did not contain a large amount of these unseen matter, then they would behave very differently. This yet to detect extra mass is giving these galaxies the required gravity to stay intact. This leads scientists to believe that more matter is present that we cannot see. This is also same with galaxies in clusters.Ĭurrently accepted theories of gravity do not explain such astronomical observations. But, if we calculate the gravity produced by the observable matter, we find that this gravity is not enough to hold them together. To hold all the masses in the galaxies together, there should be an immense amount of gravity otherwise they will get torn themselves apart.
In our universe, galaxies are rotating with very high speed.
We know about the presence of dark matter from its gravitational effects.
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