Observing a Quasar Accretion Disc

November 7, 2011

The accretion discs around supermassive black holes are too distant and too small to observe using conventional methods. However, by combining gravitational macrolensing by an intermediate galaxy, and gravitational microlensing by stars within that galaxy, astronomers are able to probe the structure of these discs. This video explains the method used. credit: ESA

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