sentence: Neutron stars are very dense, and have short, regular spins.
sentences_before: Pulsars' are neutron stars which spin rapidly and produce huge electromagnetic radiation along a narrow beam.
sentences_after: This produces a very precise interval between pulses that range from roughly milliseconds to seconds for an individual 'pulsar'. The pulse can only be seen if the Earth is close enough to the direction of the beam.
concept_name: neutron star
headings: Pulsar
categories: Variable stars Astrophysics