Time and space don't swap places inside a black hole. However, on the inside, this asteroid falls in "before" everything else and therefore is already there when everything else falls in. Is this correct?Īnd if it is, then would this not violate causality? For example, consider that a large asteroid was supposed to fall in at the very end, but got hit by another asteroid and both avoided being sucked into the black hole. In fact, if a black hole has been growing over time gradually increasing in size by sucking the external matter in, on the inside this process would appear happening in reverse, because time inside goes from a larger to smaller radius of the event horizon. Correct? If so, the larger things that fell in at the very end appear on the inside before everything else that's been falling in over 10 billion years. Is this correct?įinally, when the larger objects fall in and increase the size of the event horizon, on the inside, a larger radius would represent an earlier time than a smaller radius. Therefore, inside a symmetrical black hole, does the sphere of the event horizon represent the same moment of time? If so, then all things that have been falling in over 10 billion years appear all at once on the inside at the same moment that the sphere of the event horizon represents. The distance from the event horizon to the center is a time coordinate. Finally, at the end, a number of larger objects also fall in that are big enough to increase the size of the event horizon. Consider that over 10 billion years a number of relatively small objects fall in. The direction inside the black hole from the event horizon to the the singularity in the center is the direction in time.Īssume a symmetrical non-rotating black hole and also assume that things can actually fall to the black hole. Supermassive black holes are found at the centre of most galaxies, including our own galaxy, the Milky Way.At the event horizon of a black hole, time and the spatial direction toward the center exchange places. The image of the black hole M87* at the top of this page was captured by a group of ground-based telescopes around the world acting in unison, effectively creating a single Earth-sized telescope that is called the Event Horizon Telescope.īecause black holes are formed at the end of a large star's life, black holes are scattered throughout galaxies.Astronomers can detect and study black holes by finding those discs and jets. However, black holes that are actively feeding on nearby stars or clouds of gas falling towards their centre will often be surrounded by bright discs or jets. Since light cannot escape a black hole, it is impossible to actually see what one looks like.The gas being pulled rapidly into a black hole can reach millions of degrees. ![]() Supermassive black holes are even colder.īut a black hole's event horizon is incredibly hot. Stellar black holes are very cold: they have a temperature of nearly absolute zero – which is zero Kelvin, or −273.15 degrees Celsius. The more massive a black hole, the colder it is. They can range from 10 times to several billion times the mass of our Sun. The boundary surrounding a black hole, known as the event horizon, varies in size.
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