How The Laser Interferometer Gravitational-Wave Observatory Detects Gravitational Waves | SYFY WIRE

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Take a look at how the Laser Interferometer Gravitational-Wave Observatory detects gravitational waves.

Credit: NSF / LIGO / Caltech / MIT

More About LIGO: The Laser Interferometer Gravitational-Wave Observatory (LIGO) is a large-scale physics experiment and observatory to detect cosmic gravitational waves and to develop gravitational-wave observations as an astronomical tool.[2] Two large observatories were built in the United States with the aim of detecting gravitational waves by laser interferometry.

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How The Laser Interferometer Gravitational-Wave Observatory Detects Gravitational Waves | SYFY WIRE
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I still don't get how you measure gravity using light. IF gravity is instantaneous how would you know that it was traveling at the speed of light, since you can only measure something at the highest possible speed of light.

rogerhuffmanjr.