The great breakthrough in understanding the nature of pulsars was the:

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The discovery of a pulsar in the middle of the Crab Nebula in 1967 was the first time that scientists had seen an object like this. It was the breakthrough that led to a better understanding of the nature of pulsars. They realized that pulsars were highly-magnetized neutron stars that emit beams of radiation from their poles, which we see as pulses of radio waves.

The Great Breakthrough in Understanding the Nature of Pulsars Was