From NOVA PBS Official.

A young astronomer set out to study binary stars—and stumbled on something invisible, massive, and groundbreaking.

In 1970, Paul Murdin noticed a star in the constellation Cygnus that appeared to orbit a massive invisible object. He later identified the unseen companion as one of the earliest known black holes.

📺 Watch the full 2-hour documentary, "Black Hole Apocalypse": https://www.youtube.com/watch?v=1LYSfpKog4w

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