PBS Space Time PBS Space Time

Can Viruses Travel Between Planets?

Oct 31, 2026 · 21m

Summary

This episode explores the emerging field of astrovirology, examining how viruses influence planetary evolution and potentially predate cellular life. The discussion covers the possibility of detecting alien viruses on Mars and ocean moons, as well as the mechanisms of interplanetary viral transport via radiopanspermia and lithopanspermia. The hosts clarify that recent pandemics like SARS-CoV-2 have terrestrial origins, while also addressing listener questions regarding modified gravity theories and the Casimir effect.

Topics discussed

Sponsors: Subaru Outback and SAP Concur Introduction to astrovirology and planetary viruses Clarifying the origin of SARS-CoV-2 Virus structure, life status, and rapid evolution Viruses as drivers of cellular evolution and origin of life Detecting alien life via atmospheric biosignatures Sponsors: SAP Concur, Subaru, and Sephora Why viruses leave no direct atmospheric or fossil signatures Searching for viruses on Mars and ocean moons Panspermia: transporting viruses via space and rock impacts Virus survival in space: radiation and vacuum resistance Sponsors: SAP Concur, Subaru, and Sephora Genome reassembly and the limits of viral survival Can alien viruses infect Earth life? Compatibility issues Debunking alien origins of recent pandemics Q&A: Modified Newtonian Dynamics and dark matter Evidence for dark matter: lensing and bullet cluster Sponsors: SAP Concur, Subaru, and Sephora Q&A: Casimir force vs. gravity on small scales Humorous Q&A: Consciousness and gravity theories Sponsors: LinkedIn and McDonald's Sponsor: Kuvasier Cognac
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