RICHARD KAIL / SCIENCE PHOTO LIBRARY RICHARD KAIL / SCIENCE PHOTO LIBRARY
Black hole travel. Spacecraft passing a black hole as it travels though space. 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. A black hole is formed when the core of a star collapses under its own weight, increasing the strength of its gravitational field to the point where, beyond a boundary known as the event horizon, nothing, not even light, can escape.
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