Most scientists now agree that the universe began with the cataclysmic explosion of an extremely dense primordial atom, and that the billions of star-filled galaxies, including the Milky Way, are still rushing outward from the original big bang. The speed of that expansion, astronomers have determined, is decreasing—slowed by the gravitational pull of the galaxies upon each other. What cannot be explained, however, is that the calculated mass of the universe's galaxies is only about one-tenth the amount required to produce that rate of deceleration. Where is the missing mass?
Black Holes. Some...
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