If the matter around a black hole is spinning around it at nearly the speed of light, then the blue/red shift on each side should be quite visible (even though we're watching at an angle). But in this image I fail to notice any.
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Answer (linked): it's not a color image. The bright side is the side that's approaching us. – rob Apr 18 '19 at 15:25
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It is a monochromatic image. – ProfRob Apr 18 '19 at 18:33