On November 28, 1967, Jocelyn Bell Burnell and Anthony Hewish discovered the first Pulsar, a fast rotating neutron star that emits a beam of electromagnetic radiation. The radiation of a pulsar can only be observed when the beam of emission is pointing toward the Earth, much the way a lighthouse can only be seen when the light is pointed in the direction of an observer, and is responsible for the pulsed appearance of emission.
A pulsar is a highly magnetized, rotating neutron star that emits a beam of electromagnetic radiation. This radiation can only be observed when the beam of emission is pointing towards the Earth, much the way a lighthouse can only be seen when the light is pointed in the direction of an observer, and is responsible for the pulsed appearance of emission.
D. Malyshev, I. Cholis, and J. Gelfand. (2009)cite arxiv:0903.1310
Comment: 23 pages, 15 figures, 1 table; v2: minor corrections, references
added; v3: 20 pages, 10 figures, 1 table, major changes in presentation, main
conclusions unchanged; v4: minor corrections.