ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Black hole, abstract computer artwork. Matter is spiralling into the black hole, dragged by the immense gravitational forces. This causes the matter to give off high-energy X-rays. A black hole is formed when the core of a star collapses under its own weight. This increases its gravitational field to the point where, beyond a boundary known as the event horizon, nothing, not even light, can escape. Only sufficiently massive stars form black holes, doing so when they have used up the fuel that sustained their nuclear fires.
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