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MinutePhysics: Season 2012

2012x09 What are years... and the galactic supermassive black hole!

  • 2012-02-28T14:00:00Z on YouTube
  • 3m
  • United States
  • Documentary
It's leap year time... so what are years, anyway? And what do they have to do with the supermassive black hole in the core of the milky way?
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