• Have we ever detected a gravitational wave?

    Yes!  On September 14, 2015, LIGO directly detected gravitational waves for the first time in history.  You can read more about that event here.  Since then, there have been several other signals that have been detected — either as confirmed gravitational-wave events or possible events without quite enough evidence to be sure that they weren't just noise.  Astronomers hope to learn more interesting facts about our universe from future direct detections.

    Before that, though, gravitational waves had only been detected indirectly. The 1993 Nobel Prize in physics was awarded to Russell A. Hulse and Joseph H. Taylor, Jr., for their observation of a binary pulsar, which lost energy in exactly the way that we expect gravitational waves would carry energy away.

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Now, here, you see, it takes all the running you can do, to keep in the same place. If you want to get somewhere else, you must run twice as fast as that.

The Red Queen in Lewis Carroll's Through the Looking Glass

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About SXS

The SXS project is a collaborative research effort involving multiple institutions. Our goal is the simulation of black holes and other extreme spacetimes to gain a better understanding of Relativity, and the physics of exotic objects in the distant cosmos.

The SXS project is supported by Canada Research Chairs, CFI, CIfAR, Compute Canada, Max Planck Society, NASA, NSERC, the NSF, Ontario MEDI, the Sherman Fairchild Foundation, and XSEDE.

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RT @KeefeMitman: Nearly 50 years ago, my advisor, Saul Teukolsky, showed how a perturbed black hole rings down to a state of equilibrium. T…

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