EVERYTHING in the universe is constantly being stretched and squeezed by disturbances in space-time that are caused by the movements of massive objects. Now, astronomers may have caught the first glimpse of this sea of gravitational waves permeating the entire cosmos, known as the gravitational wave background. It is the result of work by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) consortium, which used a so-called pulsar timing array to attempt to build a sort of map of gravitational waves.
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