What characteristic allows astronomers to detect rapidly spinning neutron stars as pulsars?

Answer

Emission of electromagnetic radiation beams from magnetic poles sweeping across Earth

Pulsars are rapidly spinning neutron stars whose magnetic poles emit focused beams of electromagnetic radiation; when these beams periodically sweep across Earth due to the star's rotation, they are detected as pulses.

What characteristic allows astronomers to detect rapidly spinning neutron stars as pulsars?

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