Scientists may have found an answer to the mystery of dark matter [Video]

For about 50 years, the scientific community has been grappling with a substantial problem: There isn’t enough visible matter in the universe.Related video above: Space junk crashed through family’s roof, NASA saysAll the matter we can see — stars, planets, cosmic dust and everything in between — can’t account for why the universe behaves as it does, and there must be five times as much of it around for researchers’ observations to make sense, according to NASA. Scientists call that dark matter, because it does not interact with light and is invisible.In the 1970s, American astronomers Vera Rubin and W. Kent Ford confirmed dark matter’s existence by looking at stars orbiting at the edge of spiral galaxies. They noted that these stars were moving too fast to be held together by the galaxy’s visible matter and its gravity — they should have been flying apart instead. The only explanation was …