It's a bold new era in science.
For the second time in less than a year, physicists have detected ripples in the fabric of spacetime, called gravitational waves, that Albert Einstein predicted the existence of 100 years ago.
The waves came from two black holes colliding together about 1.4 billion light-years from Earth, and a giant experiment called LIGO detected them.
But that's just the first of many more discoveries that gravitational waves could bring us.
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