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gravitational lensing

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A missing ingredient in dark matter theories?

In 1933, Fritz Zwicky, observing the Coma galaxy cluster, noted that single galaxies were moving too fast for the cluster to remain bound, according to the measure of visible mass. Only a far more significant amount of invisible matter could explain the strong gravitational force... click to read more

  • Massimo Meneghetti | Researcher at Osservatorio di Astrofisica e Scienza dello Spazio, Istituto Nazionale di Astrofisica (INAF), Bologna, Italy
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gravitational lensing
galaxies
dark matter
Galaxy Clusters
Views 1460
Reading time 3.5 min
published on Mar 31, 2021
A natural close-up of a pierced galaxy 18 billion light-years away

Einstein's general theory of relativity predicted that gravity not only acts between two masses but also affects light which has no mass. We cannot see this effect in everyday life, but when light travels over vast intergalactic distances and is affected by the incredibly large... click to read more

  • T. Emil Rivera-Thorsen | Postdoctoral Research Fellow at Department of Astronomy, Oskar Klein Center, Stockholm University, Stockolm, Sweden
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gravitational lensing
galaxies
galaxy evolution
Views 3022
Reading time 3.5 min
published on Oct 1, 2020