365 Days of Astronomy - Weekly Edition
Ep. 522: Judging Age & Origins, part 1 - Earth Rocks
18 Mar 2019
Description
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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