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Home Q & A Board Science-Related Homework Help Physics
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doit_the_clown doit_the_clown
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7 years ago
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

Discovering the Universe


Edition: 7th
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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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discovererdiscoverer
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7 years ago
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doit_the_clown Author
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7 years ago
Helped a lot
njn;l
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Yesterday
Thank you, thank you, thank you!
jasonbourne
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2 hours ago
Brilliant ツ
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