Here's a sobering fact: The matter we know and that makes up all stars and galaxies only accounts for 5% of the content of the universe! But what is dark matter? One idea is that it could contain "supersymmetric particles" – hypothesized particles that are partners to those already known in the Standard Model. Dark matter seems to outweigh visible matter roughly six to one, making up about 27% of the universe. In fact, researchers have been able to infer the existence of dark matter only from the gravitational effect it seems to have on visible matter. This means it does not absorb, reflect or emit light, making it extremely hard to spot. Unlike normal matter, dark matter does not interact with the electromagnetic force. This strange and unknown matter was called “dark matter” since it is not visible. They think something we have yet to detect directly is giving these galaxies extra mass, generating the extra gravity they need to stay intact. The same is true of galaxies in clusters, which leads scientists to believe that something we cannot see is at work.
They are rotating with such speed that the gravity generated by their observable matter could not possibly hold them together they should have torn themselves apart long ago.
Galaxies in our universe seem to be achieving an impossible feat.
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