1. The First Image of a Black Hole (2019) (19/20)

In 2019, scientists captured the first-ever image of a black hole, located in the galaxy M87. Using the Event Horizon Telescope, an international team of researchers revealed a glowing ring of light surrounding the shadow of the black hole. This groundbreaking achievement confirmed predictions of Einstein’s theory of general relativity and offered unprecedented insight into one of the universe’s most mysterious phenomena.