In physics, gravitational waves are ripples in the curvature of space-time that propagate as a wave, traveling outward from the source. Predicted to exist by Albert Einstein in 1915 on the basis of his theory of general relativity, gravitational waves theoretically transport energy as gravitational radiation. | MARK GARLICK/SCIENCE PHOTO LIBRARY

Gravitational Waves From Merging Black Holes Detected by New Joint Network

A three-way network of gravitational-wave detectors on different continents shows potential for learning more about Einstein's ripples in space-time.