Science & Futurism with Isaac Arthur cover image

The Fermi Paradox: Galactic Habitable Zones

Science & Futurism with Isaac Arthur

00:00

The Time Factor in Galactic Habitability

Quasars seem to have been most common and active 10 billion years ago. Metallisthe isn't just about time for individual stars in nebulae, it's about the local accumulation of metals from various supernovae and other nucleosynthesis events. The oldest population one stars are still very low on metals, about a tenth what our sun has - they haven't been born yet.

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