We hear that rocks are a certain age, and stars are another age. And the Universe itself is 13.7 billion years old. But how do astronomers figure this out? I know it’s impolite to ask, but, how old are you? And how do you know? And doesn’t comparing your drivers license to your beautiful and […]
Podcast (audio): Download (Duration: 4:03 — 3.7MB)
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Podcast (video): Download (Duration: 4:26 — 52.7MB)
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