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What is an Einstein cross?(a)Four images in a cross shape created by gravitational lensing of a ...

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What is an Einstein cross?(a)Four images in a cross shape created by gravitational lensing of a ...

What is an Einstein cross?

(a)   Four images in a cross shape created by gravitational lensing of a distant quasar by an intervening galaxy
(b)   Four radio jets approximately at right angles to each other emanating from the nuclei of certain active galaxies
(c)   The flat accretion disk around a black hole, seen edge-on, with two jets being ejected in each direction perpendicular to the disk, forming a cross

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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