Gravitational Wave Detectors: Listening to Space-Time

Gravitational wave detectors measure tiny ripples in space-time caused by cosmic collisions.
The most famous detectors are LIGO in the U.S. and Virgo in Europe.
They use laser interferometry to detect changes smaller than a proton’s width.
In 2015, LIGO made the first detection from two merging black holes.
These signals confirmed a major prediction of Einstein’s general relativity.
Detectors can “hear” neutron star collisions, revealing heavy element creation like gold.
Gravitational waves carry information invisible to light-based telescopes.
Networks of detectors pinpoint where in the sky the waves come from.
Future observatories like LISA (in space) will detect lower-frequency waves.
Gravitational wave astronomy has opened a brand-new window on the universe.