Exciting news! The Laser Interferometer Gravitational wave Observatory (LIGO) started it its first observation run after a major upgrade to Advanced LIGO,
http://www.caltech.edu/news/advanced...erations-47898.
The LIGO detectors are looking for gravitational waves coming from the most violent events in the universe (binary neutron star mergers, binary black hole mergers, GRB etc). These detectors are looking for minuscule displacements of suspended test masses on earth, due to these gravitational waves.
More details of LIGO can be found here,
http://www.ligo.org.
Bram