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Gravitational waves

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description Gravitational waves Overview

Gravitational waves are disturbances in the fabric of spacetime generated by extremely energetic events like merging black holes or neutron stars. Predicted by Einstein’s theory of general relativity, their detection offers a new way to observe the universe and study extreme astrophysical phenomena. Scientists use them to investigate processes previously inaccessible through traditional electromagnetic observation, primarily benefiting those researching cosmology, astrophysics, and fundamental physics.

help Gravitational waves FAQ

When were gravitational waves first detected?

Gravitational waves were first directly detected on September 14, 2015, by the Laser Interferometer Gravitational-Wave Observatory (LIGO), nearly a century after Einstein predicted them in 1916. The signal, designated GW150914, was produced by the merger of two black holes roughly 1.3 billion light-years away.

How does LIGO detect gravitational waves?

LIGO operates two L-shaped interferometers—one in Hanford, Washington, and one in Livingston, Louisiana—each with arms 4 kilometers long that use laser beams to measure spacetime distortions smaller than the diameter of a proton. The dual-site setup helps confirm signals and roughly triangulate the cosmic source of each event.

What was the first gravitational wave event detected by LIGO?

The first event, GW150914, was produced by the collision of two stellar-mass black holes of approximately 29 and 36 solar masses. The merger converted about three solar masses of energy into gravitational radiation in a fraction of a second.

Did Einstein believe gravitational waves could be detected?

Einstein predicted gravitational waves in his 1916 and 1918 papers on general relativity but doubted they would ever be observed because the distortions reaching Earth are unimaginably small. He even briefly published a 1936 paper arguing the waves might not be real, though he later retracted that claim.

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