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Pulsars emit cones of bright radio emission from their magnetic poles as they rotate rapidly. Because these stellar remnants can spin so quickly, their outermost magnetic field lines cannot move fast enough and do not reconnect. Pulsars are rapidly rotating, highly magnetic compact stars.
Among the best clocks known, natural or man-made, are the spinning, magnetized neutron stars called pulsars. Pulsars emit short bursts of electromagnetic radiation at intervals from one every few seconds to thousands of times a second with a regularity that exceeds that of watches of the highest precision.

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