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Two black holes collide (Photo: Getty Images/Gallo Images)
Two black holes collide (Photo: Getty Images/Gallo Images)

Scientist have discovered that they’ve recorded the shockwaves from two black holes merging in space – and that it happened 7 billion years ago! 

The two black holes collided and merged into a new black hole, the size of which no one has seen before. 

What are black holes? How do the scientists know two collided? And why have they only recorded this now?  

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