黑洞研究又有新发现！

Core Viewpoint - The "Tian Guan" satellite (Einstein Probe Satellite) has captured an unprecedented high-energy cosmic explosion, which is believed to be the process of a medium-mass black hole tearing apart a white dwarf star, as reported in the academic journal "Science Bulletin" [1][2]. Group 1: Event Details - The "Tian Guan" satellite detected an exceptionally bright and rapidly changing X-ray source, designated "EP250702a," on July 2, 2025 [1]. - Following the detection, multiple global telescopes conducted a coordinated observation, confirming the source's location at the outskirts of a galaxy with a redshift of 1.04 [1]. - The "WXT" (Wide Field X-ray Telescope) and "FXT" (Follow-up X-ray Telescope) on the "Tian Guan" satellite played crucial roles in the observation, with the brightness of the event decreasing over ten days by more than 100,000 times after an intense explosion lasting about one day [1]. Group 2: Scientific Implications - The event "EP250702a" exhibited a series of unconventional characteristics, including multiple explosions from billions of light-years away, emitting extremely high energy, and rapid, complex changes in brightness and energy spectrum [2]. - The observed phenomena resemble rare black hole tidal disruption events, suggesting that a medium-mass black hole is involved in the process of tearing apart a white dwarf star, which is a dense celestial body [2]. - This event may provide the first clear evidence of such processes, aiding in the understanding of the long-missing population of medium-mass black holes and opening new avenues for research in black hole growth and the ultimate fate of dense celestial objects [2].