A neutron star is a dead, extremely dense, rotating star. A pulsar is a type of neutron star that must be both magnetized and move very quickly, because its magnetic field rotates fast enough to produce a beam of electromagnetic radiation. Astrophysicist Andrea Lommen explains a study of the binary system known as PSR 1913+16, in which a neutron star and a pulsar orbit each other. This study gave a result that only Einstein would have found without surprise: gravitational waves must exist!

Original program date: June 4, 2010
Watch the full program here: https://youtu.be/Bgi8z0fB6PI

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