MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Black hole, illustration. A black hole is an object so compact (usually a collapsed star) that nothing can escape its gravitational pull. Not even light. This black hole is surrounded by a superheated disc of material, an accretion disc, making it visible. The massive gravity is also pulling in a nearby gas cloud, top right.
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