Einstein's wild prediction
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The ultimate measuring sticks
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The day the universe trembled
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The future of wave hunting
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YOUR GOAL
Master of Ripples in spacetime
artiteacher The ultimate measuring sticks
We catch the ripples as the stars collide, Sensing a shift smaller than a proton wide.
LIGO's extreme vacuum: The air pressure inside LIGO's giant beam tubes is reduced to one-trillionth of an atmosphere, making it one of the largest pure vacuum chambers on Earth.
A device that produces an intense, narrow beam of coherent monochromatic light. In 2015, LIGO used highly stable lasers to detect cosmic ripples from a binary black hole merger.
What instrument does LIGO use to measure the microscopic changes in its arm lengths?
By what fraction of a proton's width does a typical gravitational wave change LIGO's arm length?
How long are the perpendicular arms of the LIGO detectors in the United States?
Why does the LIGO experiment require at least two separate detectors in the United States?