Assertion: pulsar's period | /r/HasProperty | pulsar
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Source sentences:
text: Within a year or so of the initial discovery, it became clear that (1) pulsars are fast, with periods known in 1968 from 0.033 seconds (the Crab pulsar) to about 2 seconds, (2) the pulsations are very regular, with a typical rate of change of only a second per ten million years, and (3) over time, the period of a pulsar always increased slightly.