
s3e4: What IS Life, Anyway?
From syzygy by Chris Stewart & Emily Brunsden
January 28, 2026 · 1h 14m · Season 3 · Episode 4
About this episode
Chris and Emily discuss the principles of life with guest Dr Kelly Redeker, exploring the definition and origins of life both on Earth and beyond.
Finaly — finally! — Chris and Emily get to the meat of the matter in this season on life in the universe. Very special guest Dr Kelly Redeker from the Department of Biology at the University of York breaks down the principles of life, both on Earth and on other worlds (or "slimy rocks" as Emily insists on calling them). Do you need a Frankenstein-esque spark? Is life inevitable? What about complex life? Intelligent life? And Emily asks Kelly the big question: will we find life outside our planet? On the web: syzygy.fm Help us make Syzygy even better! Tell your friends and give us a review , or show your support on Patreon: patreon.com/syzygypod Syzygy is produced by Chris Stewart and co-hosted by Dr Emily Brunsden from the Department of Physics at the University of York. Some of the things we talk about in this episode: • Special guest Dr Kelly Redeger • How to define life • The origins of life • Non-carbon-based life
People in this episode
Hosts: Chris Stewart, Emily Brunsden
Guest: Dr Kelly Redeker
Topics covered
- life in the universe
- principles of life
- origins of life
- intelligent life
- life outside Earth
Keywords
- life
- universe
- intelligent life
- origins of life
- non-carbon-based life
Mentioned in this episode
Organizations: Department of Biology at the University of York, Department of Physics at the University of York, Patreon
Books & works: syzygy.fm
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