A Pulsar is nothing more than a highly magnetized rotating neutron star or white dwarf that emits a beam of electromagnetic radiation acting as a natural light house in the universe. A neutron star eventually grows old and collapses. Only a small mass of its original size remains and this is extremely dense. Therefore in order to maintain angular momentum, it has to spin faster now and emits a blast of radiation along its magnetic field lines. They have regular rotational periods, which produces a very precise internal in its pulses. These internal pulses range from few milliseconds to couple of seconds. In fact, it is said that certain types of pulsars rival atomic clocks in their accuracy in keeping time. The first pulsar was discovered in 1967 by Jocelyn Bell Burnell and Antony Hewis and its pulsating period was about 1.33 seonds.
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