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  3. 365 Days of Astronomy - Weekly Edition Podcast
  4. Ep. 522: Judging Age & Origins, part 1 - Earth Rocks

People always want to know how old everything is. And more
specifically, they want to know how we know how old everything
is. Well, here at Astronomy Cast, it's our job to tell you now
only what we know, but how we know what we know. And today we'll
begin a series on how we know how old everything is.


This is part one of a double episode.

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