According to foreign media reports, there are still many places people don’t know about black holes. In addition to being mysterious, huge and confusing everywhere, it has been proved that there is another thing that people should pay attention to, that is, it is noisy. According to a study recently published in communications physics by arc centre of excellence for gravitational wave discovery, < / P > < p > describes in detail how black holes emit signals of increasing frequency and amplitude as they approach, showing the speed and radius of orbits. At first, it was thought that a black hole would release the last signal after a collision, but studies have shown that this is not the case. Juan Calder ó n busillo, lead author of the study, said: “when we look at black holes from the equator, we find that the last black hole sends out more complex signals, and its tone rises and falls several times before it disappears. In other words, the black hole actually chirps several times < / P > < p > this study may be useful for modeling future research, especially when it comes to evaluating concepts like general relativity. Rory Smith, from the school of physics and astronomy at Monash University, said it was important to explain the extra chirp because they were astrophysics that used gravity wave models to learn the source of these waves. “We need models that can explain all the possible characteristics of real gravitational waves.” Global Tech