The Absorption Lines in the Solar Spectrum

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The solar spectrum for reference, you know, all the dips are overlapping because the abundance of all the elements is so high. The old stars have so little off all the elements that they're only occasionally these dips that then indicate, okay, that one at that wavelength was iron. And here we have carbon and there's magnesium and sodium. There's a little strontium line here. So we have a much easier way to map out this barcode that the spectrum pretty much is at the end of the day.

Anna Frebel is an astronomer and astrophysicist at MIT. Please support this podcast by checking out our sponsors:
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OUTLINE:
Here’s the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time.
(00:00) – Introduction
(05:26) – First elements
(12:35) – Milky Way
(16:11) – Alien worlds
(19:16) – Protogalaxies
(24:29) – Black holes
(29:27) – Stellar archeology
(38:42) – Oldest stars
(46:32) – Metal-poor stars
(1:02:05) – Neutron capture
(1:07:01) – Neutron stars
(1:12:30) – Dwarf galaxies
(1:17:10) – Star observation
(1:45:27) – James Webb Space Telescope
(1:51:17) – Future of space observation
(1:54:26) – Age of the universe
(2:07:34) – Most beautiful idea in astronomy
(2:11:23) – Advice for young people
(2:20:17) – Meaning of life