Photo: Event Horizon Telescope Collaboration, Black hole at the center of Messier 87
Black Hole = a region of space having a gravitational field so intense that no matter or radiation can escape
— Event Horizon 'Scope (@ehtelescope) April 10, 2019
Elsewhere on the Web
What is a black hole? – NASA
Starting a recurring thread on BLACK HOLES. From history to our modern understanding and, in between, any bizarre facts about it.
— Dr. Karan Jani (@AstroKPJ) April 6, 2018