Black holes are the universe's Energizer Bunnies. They are the most efficient "machines" for transforming matter into energy through their intense gravitational pull.
For example, the early universe was ablaze with untold supermassive black holes pouring out prodigious amounts of energy from the cores of galaxies. 11 billion years ago the black holes did the heavy lifting by reheating the universe and therefore inhibiting new generations of stars to form in some small galaxies.
Black Hole Driven Starships Might Ply the Galaxy : Discovery News
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