Two of the most sensitive detectors ever built have been waiting for a ripple, and it finally came last September; smaller than a fraction of a proton, a discrepancy appeared: the echo of the collision of two enormous black holes colliding a billion years ago. This is now known as a gravitational wave, scientist Albert Einstein‘s discovery.

In 1905, Einstein proposed new concepts of time and space, determining that the laws of physics are the same for all non-accelerating observers. He determined that gravity is felt as a distortion in space-time caused by massive objects, such as planets. The sound of the ripple wave from the collision of the black holes confirmed his theory.

As of January, a spacecraft finally arrived in space a million miles from the Earth, where gravity from the earth and the sun cancel out. Scientists have set up three lasers, each a million kilometers apart and linked with lasers, simply waiting for gravitational waves. This project is dedicated to Einstein’s theory.

For the first time, it has been proven that we can hear, not just see, the cosmos.