A tiny little woop is being called one of the greatest scientific discoveries of the past century. It's the astounding sound of two black holes colliding, a heavenly cataclysm that happened 1 billion years ago, releasing.
Here's why there's so much excitement: gravitational waves. They're ripples in space-time theorized by Einstein a century ago, but they've never been directly observed, until now.
Dr. Scott Hughes, professor of physics at MIT.
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