Cygnus X 1
Dec. 19, 2024
NASA - Cygnus X-1: A Stellar Mass Black Hole Cygnus X-1 in 60 Seconds - YouTube First Black Hole Ever Detected – Cygnus X-1 – Is Much More Massive Than We Thought Weird Object: Black Hole Cygnus X-1 | Astronomy.com | Cygnus X 1