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Guide to Space

How Do We Know How Old Everything Is?

22 Dec , 2014 by Fraser Cain

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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age, carbon - 12, carbon-14, cosmic microwave background radiation, distance, radioative decay, radiometric dating, spectra, spectroscopy, stars, telescope

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