Exposure of the densest black hole group in history： the high particle energy is rare in the universe

　　Beijing, Jan. 8 (Xinhua) According to foreign media reports, American astronomers recently discovered the densest supermassive black hole group in the history of human cosmic observation by using X-ray images observed by high-tech telescopes.

　　According to reports, astronomers use the observation data of NASA’s Chandra X-ray Observatory and India’s Giant Meter Wave Radio Telescope to make X-ray pictures.

　　According to the density standard of the earth, the density of black holes is equivalent to about 5000 earths distributed on the surface of the whole moon. The findings were announced at the meeting of the American Astronomical Society in Texas last week.

　　At the meeting, experts also published the results of another study of galaxy clusters. Researchers at the Harvard-Smithsonian Center for Astrophysics found that two giant galaxy clusters, abel 3411 and abel 3412, which are about 20 billion light-years away from the Earth, collided with neighboring supermassive black holes, and the hot gas layers of the two galaxy clusters penetrated each other, with the high energy of the particles being "rare in the universe".

　　It is reported that astronomers therefore described the phenomenon as an "amazing cosmic particle accelerator".