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Everything we know about the universe and all the laws of physics, apply to four percent of the universe. The other 96 percent are the unknown phenomena of dark matter and dark energy. “If we account for all the matter and energy that we’re familiar with,” says Neil deGrasse Tyson, “and measure up how much gravity it should have, it’s one-sixth of the gravity that’s actually operating on the universe. We call that dark matter. It really should be called dark gravity. and we don’t know what that is.”

Now, a new theory about the nature of dark matter as a “dark force” helps explain why a pair of galaxies about 65 million light-years from Earth contains very little of the mysterious matter, according to a study led by a physicist at the University of California, Riverside.

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Category: Science