AT 2021hdr is a binary supermassive black hole (BSMBH) system in the center of a galaxy 1 billion light-years away, in the Cygnus constellation. In 2021, researchers observing it using NASA’s Zwicky ...
The sky, the sea, and even space conceal phenomena that remain unexplained. For decades, reports have poured in describing objects or events that defy our current understanding. These accounts, often ...