![]() ![]() ![]() But you couldn’t actually see the black hole itself, not directly. The video: very slow images until they stop and the data fades away.It was only last year that astronomers were finally able to unveil the first pictures of the supermassive black hole at the centre of our Milky Way galaxy. However, what you see in the moment that you pass through the horizon is dependent on things we don’t know yet. If you fall in you should pass right through it. Whereas the event horizon itself is only special from an outside perspective. So, right before the probe passes through the event horizon, it’ll get radiated with a universe’s lifetime worth of starlight and microwave background radiation. The blue shift of the incoming light turns it into gamma rays. As a result the rest of the universe becomes bluer, hotter, and brighter. Things farther from the blackhole move through time faster, so the rest of the universe will speed up from your probe's point of view. The Probe: First, torn apart and crushed, but let's skip that detail. Technically, you’ll never actually see someone fall into a blackhole, you’ll just see them get really close. As it approaches the event horizon their movement through time will halt, as they fade completely from view. It will appear redder, colder, and dimmer. Viewing far from the blackhole: As the probe falls in it will move slower and slower through time. If the Earth were somehow compressed into a black hole, its Schwarzschild radius would be about 1 cm. $\mu$ is the standard gravitational parameter for the mass of the black hole $M$, $\mu=GM$, and $c$ is the speed of light. That distance for a simple, non-rotating black hole is called the Schwarzschild radius, equal to $2\mu\over c^2$. Therefore, given that the speed of light is a universal speed limit, nothing inside of the event horizon can ever escape. The event horizon is defined as the distance from the center of the black hole at which the gravitational escape velocity equals the velocity of light. See this excellent blog post for a discussion of the current debates. You might make it across uneventfully (pun intended), or you might be completely destroyed right at the event horizon. When considering the quantum mechanics and quantum information transfer at the event horizon of a black hole, it all becomes very complicated. Interestingly, what happens when you cross the event horizon is a subject of great debate. The time dilation noted in another answer here results in the signal being Doppler shifted to lower and lower frequencies, with the encoded data going to lower and lower data rates, and the intensity going down rapidly until you receive the last photon from the probe as it dims to nothing.įor supermassive black holes, spaghettification will not occur until after crossing the event horizon, so you can survive an approach to the event horizon. So the last signal you will get from the probe will be just before it crosses the event horizon. ![]() By definition the "material," if there is such a thing, at the center of a black hole is inside the event horizon. No signal can reach us from the probe since photons can't escape. If by "enters it" you mean crossing the event horizon, then the easy answer is: we'll never know. ![]()
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