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Is there a safe distance in which a black hole can be observed with the human eye? What is a safe distance?

I have seen many computer simulated and artist renditions, and I am not sure if they depicted the true colors and shape of BH.

Below I have a few of examples of what may a BH may look like rendered.

enter image description here How light from the accretion disk maybe refracted by gravitational lensing. http://www.physics.utah.edu/~bromley/blackhole/index.html

enter image description here enter image description here https://www.bbc.com/news/science-environment-38937141

enter image description here https://www.nasa.gov/connect/chat/black_hole_chat.html

Should these models be mixed to make a more complete rendition of a BH?

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    $\begingroup$ this is a great question $\endgroup$ – Fattie Apr 12 at 19:58
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    $\begingroup$ Yes. There are a lot of crap depictions of black holes out there, and I think a list of pictures, both good and bad, would be helpful for the general public who search for them. $\endgroup$ – Ingolifs Apr 13 at 2:36
  • $\begingroup$ Apparently fictional Gargantuan from the movie Interstellar is a good simulation. I would expect something more on line with the top picture, with Doppler like shifts. I would say that any decent pic should be seen keeping in mind what exact phenomenon has been simulated (synchrotron rad, emission from external matter, rotation....) of it is supposed to be a global rendering in the vis. $\endgroup$ – Alchimista Apr 13 at 8:59

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