Jocelyn Bell Burnell describes how she discovered pulsars - Beautiful Minds_Ep1 Preview_BBC Four
English astronomers Jocelyn Burnell and Antony Hewish discovered the first pulsar. They came across repeating radio signal with a period 0f 1.33 seconds. The period was too short for known astrophysical phenomena. The astronomers also knew that the signal does not come from the Earth. It looked almost like a signal from aliens, but it was a new type of star instead.