RICHARD KAIL / SCIENCE PHOTO LIBRARY RICHARD KAIL / SCIENCE PHOTO LIBRARY
Black hole research. Spacecraft (top) monitoring a comet that has been drawn into a black hole (bottom). The white area around the black hole is its accretion disc, consisting of matter that has been drawn into orbit around it and which heats up and emits radiation before it passes over the event horizon into the non-visible region (black). This region is where gravity is so strong that not even light can escape.
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