. >> the guy who discovered pluto davis series of lectures that there is so little doubt with a narrow n they said how did you know that was played no? he said there was a narrow pointing to it to. [laughter] >> black hole are interesting one of the dramatic discoveries off the week to get into the book just-in-time was the most direct evidence yet a with proved that as the general theory of relativity imagined to swirling around each other. if predicts that those two black kohl's will warp space and time to send ripplese when like throwing a stone into a pond did turns out from traveling at the speed of light. it causes sows to get closerhe together. >> be observatory with the gravitational wave was built to measure that distortion of the fabric of space and time think consists of an extremely long of the 4-kilometer length with the of with the of a single proton. there is 29 of them merging together to make a single black hole and then say that does not make sense?not ma something seems to be missing. but that missing piece is the energy lost in the gravitational wave. remember e=mc2