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Black hole model
Black hole. Computer model of distortions in the view of an accretion disc due to the immense gravity of the rotating black hole it orbits. Temperature is colour-coded: red (coolest) to blue/white (hottest). Four hot spots have been added to the disc. The one behind the hole is seen as an arc; its light has been bent over the hole by gravitational lensing. The light is blue shifted (left) and red shifted (right) due to the disc's anticlockwise rotation. A black hole is a region where the gravitational field is so strong that light cannot escape. Work done at Johns Hopkins University, Maryland, USA.
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