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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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doit_the_clown Author
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7 years ago
Correct Slight Smile TY
MLynneMcMillan
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Yesterday
I appreciate what you did here, answered it right Smiling Face with Open Mouth
Lawson1981
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2 hours ago
Just got PERFECT on my quiz
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