Things like dust and gas molecules colliding or rubbing against each other as they spiral inwards might emit radiation, which can then be used to map out the spacetime near a black hole’s event horizon, though not inside it. Some supermassive black holes, for example, are seen to be emitting tremendous torrents of energy as they feed on infalling material. Understanding the details of that process is “one of the major lines of black hole research” says Dan Wilkins at the Kavli Institute for Particle Astrophysics and Cosmology, in the US, who was not involved in the new EHT research. Large clouds of gas formed by the Big Bang may also have collapsed in on themselves in the early universe to form black holes.
The harder you throw the tennis ball, the faster it is travelling when it leaves your hand and the higher the ball will go before turning … Read MoreRead More »