The Arecibo Observatory leaves behind a huge legacy, from sending messages to aliens to finding the first hints of gravitational waves.
, unseating the Crab Nebula neutron star as the fastest known pulsar . That find was puzzling at first because PSR 1937+21 is older than the Crab Nebula pulsar, and pulsars were thought to rotate more slowly with age.
Then, astronomers realized that old pulsars can “spin-up” by siphoning mass from a companion star, and flash every one to 10 milliseconds. The NANOGrav project now uses such rapid-fire radio beacons asPulsars typically rotate more slowly as they age. But data from Arecibo showed that pulsars can ‘spin-up’ to rotate hundreds of times per second by siphoning material off a neighboring star .
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