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gravitational lens |
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gravitational lens n (Astronomy) Astronomy a lenslike effect in which light rays are bent when passing through the gravitational field of such massive objects as galaxies or black holes
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| Using Sloan data, the team picked out large, elliptical galaxies capable of acting as gravitational lenses. For instance, astronomers can measure the density of small galaxies or the cores of larger galaxies by determining how well they act as gravitational lenses. Tyson adds that the prevalence of gravitational lenses provides another test of whether or not the universe has revved up the rate at which it is expanding, as recent studies of distant supernovas have indicated (SN: 4/7/01, p. |
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