Monday, 21 October, 2019

The extreme and warped reality of black holes

A still image of a black hole seen from the side Caught in the act: a black hole rips apart an unfortunate star
Sandra Phillips | 27 September, 2019, 12:26

Seen almost edgewise, the turbulent disk of gas churning around a black hole takes on a insane double-humped appearance.

NASA took to Twitter to post about the same, writing that that gravity of the black hole is no "intense" that it "distorts its surroundings like a carnival mirror".

The visualisation simulates the appearance of a black hole where matter has collected into a thin, hot structure around it called an accretion disk.

The black centre represents the event horizon, where the pull of the black hole is so severe nothing can escape it, with waves and particles not having the necessary escape velocity to resist its draw.

Given that a black hole's gravitational pull is so strong that anything, including light, gets devoured, it's extremely hard to capture one on camera. This so-called "photon ring" is composed of multiple rings, which grow progressively fainter and thinner, from light that has circled the black hole two, three, or even more times before escaping to reach our eyes. Gradually it visually transforms the lower part of the disk in the photonic ring is a bright ring of light that delineates a black hole.

The other half, he says, is that they were able to detect it early, train more telescopes on the black hole, and capture unprecedented data about the rare event.

Black hole annotation

The Tidal Disruption Event (TDE) could only have occurred if the distance between the supermassive black hole and the star was at least as far as the Sun from the Earth, according to scientists at the National Aeronautics and Space Administration (NASA). Meanwhile, the outer portions of the disk travel slightly slower. This difference expands and sheers the bright knots, creating light and dark lanes in the disk. In the simulation, matter is moving through the accretion disk from left to right.

The U.S. space agency's orbiting Transiting Exoplanet Survey Satellite, better known as TESS, revealed the detailed timeline of a star 375 million light-years away warping and spiralling into the unrelenting gravitational pull of a supermassive black hole, researchers said on Thursday. Glowing gas on the left side of the disk moves toward us at a speed so fast that the effects of Albert Einstein's relativity elevates its brightness.

Black holes usually reside at the center of most large galaxies, including our Milky Way.

A network of 20 robotic telescopes, ASAS-SN, just spotted a star getting shredded after getting too close to a black hole.

'Until very recently, these visualisations were limited to our imagination and computer programs.

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