Photo: Event Horizon Telescope, 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
2019: The Event Horizon Telescope (EHT) @ehtelescope has released a photo of the event horizon of a black hole at the heart of distant galaxy Messier 87.
First ever picture of a black hole may be revealed this week – New Scientist
Elsewhere on the Web
What is a black hole? – NASA