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What does a black hole look like? Which optical effects appear in its surroundings? What do we see when we cross its horizon? All these answers in 15 minutes!
0:00 - Introduction
1:53 - Before the fall
5:17 - Falling through the disc
8:26 - Crossing the horizon
12:42 - Conclusion
This video is narrated by Octave Masson.
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Alessandro Roussel,
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To learn more :
https://jila.colorado.edu/~ajsh/insidebh/schw.html
https://jila.colorado.edu/~ajsh/insidebh/realistic.html
Everything that crosses the horizon remains on the horizon in the form of a still afterimage that becomes increasingly redshifted until becoming undetectable.
Some hypotheses suggest that hawking radiation could carry this information back out away from the horizon, but it's only a theory.
The light of the dying star has already long radiated away from the black hole. Once the star becomes a black hole, there's no way for all that light that already escaped to just become captured. See this video here to get a short visual explanation, by the same YouTuber.