The radial size of the event horizon depends on the mass of the respective black hole and is key for a person to survive falling into one. Even light, the fastest-moving thing in our universe, cannot escape – hence the term “black hole.” Leo and Shanshan, CC BY-NDĪt the event horizon, the black hole’s gravity is so powerful that no amount of mechanical force can overcome or counteract it. The distance from a black hole’s center of mass to where gravity’s pull is too strong to overcome is called the event horizon. Anything that passes this point will be swallowed by the black hole and forever vanish from our known universe. The event horizon of a black hole is the point of no return. ![]() The second type is a supermassive black hole, with a mass of millions to even billions times greater than that of our Sun.īesides the mass difference between these two types of black holes, what also differentiates them is the distance from their centre to their “event horizon” – a measure called radial distance. The first does not rotate, is electrically neutral – that is, not positively or negatively charged – and has the mass of our Sun. There are two types of black holes that are relevant to our discussion. They can vary by size and be electrically charged, the same way electrons or protons are in atoms. The universe is littered with a vast zoo of different types of black holes. They probably had an impact on the formation of human life in our own galaxy. ![]() These intriguing objects appear to be an essential ingredient in the evolution of the universe, from the Big Bang till present day. Black holes are among the most abundant astrophysical objects in our universe. We are both physicists who study black holes, albeit from a very safe distance. However, there is a rather complicated catch: A human can do this only if the respective black hole is supermassive and isolated, and if the person entering the black hole does not expect to report the findings to anyone in the entire universe. To solve the mysteries of black holes, a human should just venture into one.
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