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NASA's amazing new simulation sends you diving into a black hole
It's a question that has plagued humanity since we first learned about black holes just over a century ago: What on earth would it be like to sink past the point of no return?
We don't have an answer yet, but a new supercomputer simulation is the best guess we have, based on current data.
"People often ask about this, and simulating these hard-to-imagine processes helps me connect the mathematics of relativity to real-world consequences in the real Universe," says astrophysicist Jeremy Schnittman of NASA's Goddard Space Flight Center.
"So I simulated two different scenarios, one where a camera – a stand-in for an intrepid astronaut – just misses the event horizon and slings back, and one where it crosses the line, sealing its fate."[embed]https://www.youtube.com/watch?v=chhcwk4-esM[/embed] frameborder="0″ allow="accelerometer; autoplay; Draft-record; encrypted media gyroscope? picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen>The unknown is like a flame to the moth of our curiosity, and black holes could very well be the poster child for the unknown. Formed from the cores of massive dead stars collapsing under their own gravity, they are so dense that their matter is compressed into a space that is currently indescribable to physics.
One result of this compression, however, is an event horizon. a roughly spherical boundary where the pull of gravity is so strong that not even the speed of light is sufficient to reach escape velocity.
This means that we have no way of knowing what is beyond an event horizon. Light is the main tool we use to explore the Universe. If we can't see light from inside a black hole, we just... can't tell what's in there.
Even theoretically, we face paradoxes where information is held in the event horizon from an observer's perspective and locked away forever from the perspective of a boundary-crossing object.
What we do know, however, based on the way light and matter move around black holes, is that the gravitational regime around the event horizon is just bananas. In some cases, anything that ventures too close attracts people from the edges of the forces involved. The exact point at which this happens depends on the mass of the black hole involved – stellar mass, or up to about 100 Suns in mass. or supermassive, millions to billions of solar masses.[embed]https://www.youtube.com/watch?v=crXGmeWFb9o[/embed] frameborder="0″ allow="accelerometer; autoplay; Draft-record; encrypted media gyroscope? picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen>"If you have the choice, you want to fall into a supermassive black hole," says Schnittman.
"Stellar-mass black holes, which contain up to 30 solar masses, have much shorter event horizons and stronger tidal forces, which can break up approaching objects before they reach the horizon."
Incredible discoveries in recent years have given us a wealth of data about the space around black holes. The supermassive black holes M87* and Sagittarius A*, at the centers of the M87 and our own galaxies, respectively, have been the subject of stunning direct imaging campaigns. The black hole itself is still invisible, of course, but the light emitted by the swirling, glowing clouds of material around each black hole has given us an unprecedented picture of the gravitational environment.
Schnittman, who has created several black hole simulations for NASA, based his new one on a supermassive black hole very similar to Sagittarius A*. He started with a black hole with a mass equivalent to about 4.3 million Suns and, along with data scientist Brian Powell, also from Goddard, fed their data into NASA's Discover supercomputer.[embed]https://www.youtube.com/watch?v=XgF46YYPplI[/embed] frameborder="0″ allow="accelerometer; autoplay; Draft-record; encrypted media gyroscope? picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen>After five days of operation, the program had generated 10 terabytes of data, which scientists used to create several videos of what falling into a supermassive black hole might be like. On a typical laptop, this would take 10 years.
The simulated camera starts about 640 million kilometers (400 million miles) from the black hole and moves inward. As it gets closer, the disk of material around the black hole and an inner structure known as a photon ring become clearer.
These elements, and space-time, become more distorted the closer the camera gets. Finally, the flyby completes nearly two orbits of the black hole before plunging past the event horizon and sputtering out after just 12.8 seconds.
In the other version, the camera swerves close to the black hole, before escaping the gravitational pull and flying away.It would be nice to think that, at some point, we might learn more about the environment beyond the event horizon. In the meantime, we can enjoy a glimpse of the wacky space-time antics that would exist around its perimeter – all from the safety of our planet.
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