Season 4 Episodes12
Cast2

David Ackroyd

Erik Thompson
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Ranked #1 of 12 in Season 4•+0.7 vs season avg
They sort of sound like the same phenomenon, but Pulsars and Quasars are very different. Pulsars are tiny--only a few miles across--but they spin as fast as a kitchen blender and sweep the sky with beacons of radiation that make them appear to flash on

David Ackroyd

Erik Thompson
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"Pulsars & Quasars" is episode 10 of The Universe season 4. It scored 8.0/10 from 72 votes, ranking #1 of 12 episodes this season (season average 7.3). It aired on October 27, 2009.