Latest Issue 12 Feb 2016 Latest Issue 12 Feb 2016 In physics, gravitational waves are ripples in the curvature of spacetime that propagate as a wave, travelling outward from the source. Predicted to exist by Einstein in 1915 on the basis of his theory of general relativity, gravitational waves theoretically transport energy as gravitational radiation.DAVID PARKER / Getty Images NewsSpace Got them! Gravitational waves detected – at last Einstein would be stoked. by Alan Duffy Feature Space Gravitational waves – your questions answered by Belinda Smith What are they, and why should we care? News Physical Sciences How does LIGO look for gravitational waves? by Cathal O'Connell The most sensitive ruler in the galaxy.