Black holes. The ultimate nightmare, the unknown, the "once you go in you'll never come back" of the universe. The picture above is a computer generated image of what it would look like to confront a black hole straight on. The gravity of a black hole is so powerful that it bends light and sends it back towards you. Black holes are the densest state of matter in the universe (that we know of). This particular image's background is form the 2MASS infrared sky survey, and the stars used are from the Henry Draper catalog.
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