Question

Have gravitational waves been discovered?

Answer 1

LIGO is designed to detect gravitational waves by measuring their effect using two L-shaped detectors about 3,200 kilometres apart. Passing gravitational waves are expected to make light take slightly longer to travel in one direction than the other. To us, that make it looks like a decrease in the length of one arm of the L and an increase in the other. The minuscule change is measured using lasers and mirrors. A real gravitational wave should be detected by both detectors.

Answer 2

Answer:

A century later, in 2016, researchers successfully detected the first direct evidence of gravitational waves, using the Laser Interferometer Gravitational-Wave Observatory (LIGO). This work earned three scientists the 2017 Nobel Prize in physics in October 2017.