In 1974 Stephen Hawking and Kip Thorne placed a bet on whether Cygnus X-1 was really a black hole. The wager was settled in 1990, but the world’s first black hole is still a mystery.
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ISRO Recognised Space Tutor
In 1974 Stephen Hawking and Kip Thorne placed a bet on whether Cygnus X-1 was really a black hole. The wager was settled in 1990, but the world’s first black hole is still a mystery.