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Gigantic discovery in astronomy and physics

Posted at 7:05 PM, Feb 23, 2016
A hundred years ago, Albert Einstein came up with a theory he thought was so abstract, scientists would never be able to prove it. 
 
But just this month, scientists announced they had.
 
They found proof of gravitational waves: ripples in space time caused by two black holes slamming together.
 
The discovery didn't come easily; it took 1,000 scientists from 16 countries 25 years and over $1 billion.
 
Marc Kamionkowski, a physicist and professor at Johns Hopkins University, put the issue in focus. Watch the video above for more,