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Daniel and Kelly’s Extraordinary Universe

Listener Questions #20

·54 min·5 clips
Kelly's new book asks if aliens would do physics differently, challenging humanity's cosmic intellectual arrogance.
The episode begins with Kelly introducing her upcoming book 'Do Aliens Speak Physics?', which questions whether human scientific discoveries are universally true or biased by our humanity. Daniel, a particle physicist, shares his concern that science is 'infected with our humanity,' setting a theme of cosmic humility. The first listener question, from Julie, asks about the Fermi paradox and whether it's a true paradox given the universe's vastness and time scales. Daniel explains the paradox, referencing Enrico Fermi's famous 'Where is everybody?' query and the Drake equation, which multiplies factors like the number of stars with planets and the fraction that develop technological civilizations. He discusses the 'great filter' theory, suggesting civilizations might self-destruct quickly. Daniel speculates that aliens could be too alien for us to recognize or communicate with, possibly evolving in environments like stellar atmospheres or subsurface oceans. Julie responds, appreciating the insights and rejoining 'Team Paradox.' The next question, from Pip Darkat via Discord, asks about Sukunaarchaeum, a newly discovered archaeon. Kelly explains that Archaea are one of three domains of life, distinct from Bacteria and Eukaryota. Sukunaarchaeum has an extremely small genome and lacks metabolic genes, leading some to call it a 'missing link' between life and non-life. They discuss whether viruses are alive, noting definitions require metabolism and reproduction, which viruses lack. Kelly mentions that biologist Elizabeth Waters is skeptical of the 'missing link' claim. Daniel defends taxonomy as valuable for inspiring deeper philosophical questions. The final question, from John, asks what would happen if the speed of light were halved. Daniel clarifies that changing dimensionful constants like the speed of light is complex, but explores hypothetical effects: we'd see less of the universe, cosmic structures would be smaller, black holes would have larger event horizons, and if light were much slower, relativistic effects would be daily experiences. John thanks them, humorously noting he'd hoped for more catastrophic scenarios. Throughout, the hosts encourage listeners to submit questions via email, Discord, or social media.

As heard by us

A patient walk through Archaea, the Tree of Life, and the lines between domains.

This episode takes a listener question and turns it into a measured tour of Archaea, opening with a Tree of Life poster in the dining room and moving toward the three domains near the base of life's history.

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Why you'd press play

Archaea, the Tree of Life, and a very useful look at the three domains.

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