Black hole. Computer model of distortions in the view of an accretion disc due to the immense grav- itational field of the black hole it surrounds. The view is from just above the inner edge of the disc. Temperature is colour-coded: red (cool) to blue/white (hot). The upper arc is a distorted view of the upper side of the accretion disc, with the lower arc showing the disc's underside. This is an example of gravitational lensing, the bending of light rays by high gravity. A black hole is a region where the gravitational field is so strong that light cannot escape. Work by Kevin Rauch at Johns Hopkins University, Maryland, USA.

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