Dark matter has mass but does not emit or absorb electromagnetic radiation, so it is invisible to telescopes. Astronomers detect its presence from the gravitational pull it exerts on other objects, such as stars or galaxies. The movements of distant galaxies suggest that something with?a very large mass is altering their paths by exerting a gravitational force on them. We know relatively little about dark matter,?but some believe it could be made up of a new type of subatomic particle called a WIMP (weakly interacting massive particle), although its existence has yet to be proved.
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Rigo,
Dark matter has mass but does not emit or absorb electromagnetic radiation, so it is invisible to telescopes. Astronomers detect its presence from the gravitational pull it exerts on other objects, such as stars or galaxies. The movements of distant galaxies suggest that something with?a very large mass is altering their paths by exerting a gravitational force on them. We know relatively little about dark matter,?but some believe it could be made up of a new type of subatomic particle called a WIMP (weakly interacting massive particle), although its existence has yet to be proved.