Black Hole
If light want to escape form Black Hole he can't escape Why??. The answer is that any gas or dust near the black hole tends to pulled into an accreditation disk that swirls around and into the black hole , rather like a whirlpool
Friction within the accreditation disk material causes it to lose a mechanical energy and spirl into the black hole ; as it is moves inward , it is compressed together . This causes heating of the material , just like as air compressed in a bicycle pump gets hotter.
1)https://youtu.be/e-P5IFTqB98
2)https://youtu.be/FoExPq04OQQ
3)https://youtu.be/RMqtoEZBw4c
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