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File: unnamed.jpg (19 KB, 512x306)
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So this is basically just refraction right? why all the mumbo jumbo?
>>
>So this is basically just refraction right?
No.
>>
>Light propagates through density gradient
Yes.
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>>16809687
it would be density if the light had to pass through the star but instead if can be hundreds of miles away and still have its trajectory altered

it's definitely a lot like refraction in principle, bending light from a change in medium, but this is more like changing the medium itself instead of having a transition between water and air

ie, there is no self refraction in a cup of water even if you have a ball floating in it
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>>16809687
Yes. Sophistry be damned
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>>16809599
There is no index of refraction difference to talk about. It's a lens, but just by different means.
>>
Isn't this pic wrong? When gravity has no limit, then straight lines are not possible. I mean, a star 5million lightyears away still affects spacetime around earth. Just a little little tiny bit but it has an effect. So no matter where in the universe, light can't travel in a perfect straight line because aslong as there is one single bit of mass in the universe, spacetime is always bended. Right?
How do we even know where light comes from when there are quadrupillions of waves in spacetime?
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>>16809599
The photon never got absorbed. Just left its star, cruised some minimal geodesic and BANG! Pops you right is the eye like the bitch you are. No refraction.
>>
Can photons orbit other thingd besides black holes?
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>>16809984
Where, other than near a black hole, does space make a U-turn?
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>>16809599
>refraction
It's gravitational lensing you retarded zoomer.
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>>16809984
isn't it possible with some neutron stars ?
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>>16809599
>mumbo jumbo
Thats is a racist term. Please use inclusive language. 4chan is a safe space for folkx of African descent.
>>
>>16809984
No, only black holes have the required density to form spacetime geodesics that are closed loops.
>>
>>16810173
>>16809984
Photons orbiting something (photon spheres) only happen in black holes
https://www.sciencedirect.com/topics/physics-and-astronomy/photon-sphere



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