Thursday, July 11, 2019

Back Holes II - Best Explanation So Far

Sorry, Black Holes Aren't Actually Black
[...] At the event horizon itself, space is moving at the speed of light. Which means, to someone infinitely far away, time at the event horizon no longer appears to pass.
When you observe something else fall into a black hole, you'd see that the light emitted from them would get fainter, redder, and their position would asymptote towards the event horizon. If you could continue to observe the faint photons they emitted, they'd appear to get stretched out in space and stretched out in time. They'd experience gravitational redshift, with the light emitted from them going from visible to infrared to microwave to radio frequencies.
And yet, it will never disappear entirely. There will always, infinitely far into the future, be light to observe from their fall into a black hole. Even though photons are quantized, there is no limit to how low their energy can be. With a large-enough telescope sensitive to long-enough wavelengths, you should always be able to see the light from anything that fell into a black hole. As someone falls in, their light never completely goes away.

Finally someone got the physics of Black Holes right. This is an article worth reading. 
I have pointed out so many times that time comes to a standstill at the event horizon of a Black Hole so that nothing can ever cross it, but hardly any scientist seems to understand it. Almost all articles about Black Holes mention a crossing of the event horizon, that matter reaches a point from which it cannot return anymore. General Relativity does not allow that. This point-of-no-return can never be reached. Nothing can disappear in a Black Hole during the existence of the universe. This removes entirely the information paradox that Stephen Hawking desperately tried to understand during his hole life. There is no paradox. Information never gets lost in a Black Hole.

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