By Leah Crane
Tonia Klein / NANOGrav
Everything in the universe is constantly being stretched and squeezed by gravitational waves, ripples in space-time caused by the movements of massive objects. Now, astronomers may have caught the first hints of the sea of gravitational waves that permeates everything, called the gravitational wave background.
The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) consortium found this signal using radio telescopes to form what’s called a pulsar timing array. Pulsars are neutron stars that rotate extremely rapidly and regularly, sending out beams …
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