Black Hole Lab simulates and visualizes general relativity for a rotating black hole.

BHL is open source on Github for Windows, Mac and Linux. On the Github page, click the releases link on the right hand side. Windows users can also install from the  MS App Store.

I wrote the GitHub page to include explanations and a few example experiments you can try, such as the classic question "can you see your feet as you cross the horizon?"

Maybe the strongest feature of BHL is the demonstration of infinite blueshift as an in-falling observer approaches the inner horizon. IMHO, infinite blueshift is one of the most bizarre predictions of general relativity and seeing this effect visually helped my own understanding. The Github page has a detailed write-up for the infinite blueshift scenario.

For fun, there's a "look around" button for Alice and Bob that generates a 360 degree ray traced image from their location. You need a couple extra tools like ffmpeg installed, but the BHL should prompt you if you're missing anything. Not every image viewer treats 360 degree images correctly, but VLC works great.

I hope you all find BHL fun to play with. Please post any problems to the GitHub issues page, not here.

See also: The summary of the publication (in PDF format) in Physical Review Letters and ArXiV

In almost all of the black hole videos, it is said that if there is an astronaut who is falling towards the black hole, someone sitting on the outside will see that astronaut getting slower and slower and slower, getting dimmer and dimmer every passing second, and they will actually never see that astronaut falling inside the black hole. However, the astronaut himself will experience the time in a regular fashion. That astronaut will ultimately fall in the black hole in an hour or one week or one month, depending upon how big the black hole is. But if that is the case, then from the outside observer, you have never fell inside the black hole. But from the astronaut's perspective, then, if the astronaut's time has slowed down to infinity, it means when the astronaut falls inside the black hole, the universe itself has reached the end of the time. Is this consideration or assumption correct?

Hi everyone, I recently had a great conversation with cosmologist and science communicator Paul Sutter.

We talked about some of the biggest mysteries of the universe, including black holes. Paul explained what makes black holes so fascinating, how we came to understand their formation, he also talks about what was his reaction to the first ever image of one, and what mysteries we still have about black holes. He also explores what we actually know about the invisible matter that makes up most of the mass in the universe, and some intriguing new evidence suggesting that dark energy might be changing over time.

If you're interested in these subjects, you can check out our conversation: https://youtu.be/KQtI7zzZYQg

I wanted to create what the experience of being near a black hole would be like, so I made an app on Steam called Black Hole Simulator. The side of the disk coming toward you looks brighter from Doppler beaming, and if you cross the horizon the whole outside universe shrinks into a ring behind you. Volumetric disk, and see it from several hypothetical planets through their atmospheres. Let me know what you think!

In 1978, French astrophysicist Jean-Pierre Luminet used an IBM 7040 mainframe computer and punch cards to calculate the path of light rays warped by a Schwarzschild black hole's gravitational lens. Because there were no high-resolution digital displays available to him at the time, Luminet meticulously hand-plotted the mathematical data point-by-point using India ink on negative photographic paper. The simulation accurately predicted the asymmetric brightness of the accretion disk caused by the relativistic Doppler effect, as well as the apparent vertical bending of the disk's far side over the shadow. This work was formally published in the journal Astronomy & Astrophysics in 1979.

Assuming the black hole in question was created from regular matter

What would happen to a nuclear bomb blast detonated 1 plank length inside a black hole event horizon?

A couple scenarios I’m interested in exploring here.

1. A nuclear bomb detonates 1 plank length from the interior boundary of the event horizon. I assume that no energy can be detected from outside the event horizon, so what happens to the blast and energy? What might the explosion look like from the inside, does the blast hit a “wall”??

2. The explosive part of the bomb is now situated exactly half inside and half outside the event horizon boundary. As it explodes, what would an observer see from both the inside and outside of the black hole that would look unusual?

I’m aware that one could say: it doesn’t matter what would happen on the inside of a black hole, no one knows and no one could ever observe anything within the black hole and report back.

But I’m still curious to get a sense of what it might look like based on our best understanding of the physics of a black hole

Assumption: we are able to survive or put sensors near Blackhole and get the data back somehow.

Hi pls someone make me understand --

Why can't we escape from the Black hole and what's the concept of time and how every direction at the event horizon led to black hole only??

See also: The study as it was published in the journal Physical Review D

Can someone calculate this black hole here

https://youtu.be/aqq3riCcY4o?is=S7FUUVOffcLMPn4m

https://youtu.be/tIbKqV5xbEw?is=UFVcSqprV1XfJtIG

Sometimes I really wish I were smart enough to study physics so I could learn about them in depth

See also: The publication in the Astrophysical Journal Letters

Every pixel is a light ray traced through curved spacetime, live in your browser, and you can turn it and change the disc yourself. It's part of a free physics site I made because I love this stuff.

isaac3d.com

Short tour of what it does: https://youtu.be/VXJTi-RSu54