They found that some complex theories of black hole event horizons influence their surrounding environment, including the photon sphere. Now, a team of researchers has investigated the properties of the photon sphere in theories that attempt to solve the black hole information paradox. In classical general relativity, that photon sphere is so thin that it barely even exists and is far too faint to be seen in the image of M87* taken with the Event Horizon Telescope. Eventually, they will leak out, giving rise to a thin, visible ring of light around the black hole. The orbits in that region are unstable the photons can loop around the black hole a few times, but they will not stay forever. ![]() The photon sphere is a region near a black hole where the gravity is so strong that light itself can orbit around the black hole. And lying somewhere between that event horizon and the edge of the shadow is an interesting feature that also results from the extreme bending of space: the photon sphere. The event horizon of the black hole itself is far smaller than its shadow the shadow appears so big because of the extreme bending of space near the black hole. What can this image tell us about the true nature of black hole event horizons? And that void is surrounded by a ghostly ring of light emitted by the superheated plasma surrounding the black hole. The dark void at the center is the shadow cast by the black hole's event horizon, preventing any light behind the black hole from piercing through. It's very difficult to observe black holes directly, as we usually see them only when they interact with their surroundings (usually by swallowing large clumps of gas or dust) or when they merge and release gravitational waves.īut all that changed in 2019, when a global network of telescopes known as the Event Horizon Telescope worked in concert to deliver a single image of M87*, a supermassive black hole in the center of the Virgo galaxy. ![]() And some are just downright strange.Īs of yet, however, all attempts to solve the information paradox are unproven. Some involve attempts to marry general relativity with our understanding of quantum mechanics. Some of those proposals involve extending our knowledge of general relativity. Over the past few decades, there have been many attempts to solve the information paradox.
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