Sagittarius A* Holds About Four Million Times the Mass of the Sun
The supermassive black hole at our galaxy's center was imaged for the first time in 2022.
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Gravitational Waves From Merging Black Holes Were First Detected in 2015
LIGO detected the ripples in spacetime on September 14, 2015, from two black holes that had collided over a billion years ago.
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Cygnus X-1 Was the First Widely Accepted Black Hole Candidate
The X-ray source was discovered in 1964, and its behavior convinced many astronomers it was a black hole.
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Stephen Hawking Predicted That Black Holes Slowly Lose Mass
In 1974 Hawking showed that black holes should emit faint radiation and eventually evaporate, though the effect has never been observed directly.
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The First Image of a Black Hole Was Released in 2019
The Event Horizon Telescope captured the glowing ring around the black hole at the center of galaxy M87, about 55 million light-years away.