Published in Gair Rhydd, 16th September 2020.

Seven billion years ago, two black holes collided 150 billion trillion km away from Earth. The immense gravitational waves created by this event were detected by astronomers in May last year, making it the biggest black hole collision ever discovered.

Early this September, astronomers announced their observations of this deep space event in Physical Review Letters, revealing that they had detected the collision of two black holes 66 and 85 times more massive than the Sun, creating a black hole of 142 solar masses.

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