Gravitational waves detected 100 years after Einstein's prediction

This is a view of the LIGO detector in Hanaford, Washington. LIGO research is carried out by the LIGO Scientific Collaboration, a group of more than 1000 scientists from universities around the United States and in 14 other countries. Image: LIGO Laboratory

This is an aerial view of the Laser Interferometer Gravitational-wave Observatory detector in Livingston. LIGO has two detectors: one in Livingston and the other in Hanaford, Washington. LIGO is funded by NSF; Caltech and MIT conceived, built and operate the laboratories. Image: LIGO Laboratory

The LIGO interferometer uses laser light split into two beams that travel back and forth down the arms. The beams are used to monitor the distance between mirrors positioned at the ends of the arms. The distance between the mirrors will change when a gravitational wave passed by the detector. (LIGO)