RICHARD KAIL / SCIENCE PHOTO LIBRARY RICHARD KAIL / SCIENCE PHOTO LIBRARY
Black hole's pull, conceptual image. Computer illustration showing asteroids being pulled in towards a black hole at the centre of a galaxy. Black holes occur when stars of a certain size use up all of their nuclear fuel. A star in such a situation begins to shrink and become very dense - the more dense it becomes, the greater its gravitational field, to the point that nothing, not even light, can escape.
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