ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Pulsar. Conceptual computer artwork of a pulsar. This is a rapidly-rotating neutron star, a stellar core that has collapsed to nuclear densities. It casts out narrow beams of energy as it rotates. The beams, confined by extremely strong magnetic fields, are detected as pulses of radio waves that are aligned with the rotation period of the star. The rotation period will be in a range between a few hundredths of a second and several seconds.
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