Unexplainable The Hitchhiking Microbe’s Guide to the Galaxy
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Apr 15, 2026 
K.T. Ramesh, a Johns Hopkins professor who studies impact physics and planetary materials, discusses experiments shooting microbes to test whether life can hitch rides on meteorites. Short, punchy segments cover the lithopanspermia idea, the clever lab gun shock tests, surprising survival at high pressures, and what those results mean for life’s interplanetary possibilities.
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Lithopanspermia Defined And Framed
- Lithopanspermia proposes rocks can seed life across the solar system by carrying microbes inside meteorites.
- K.T. Ramesh breaks the word into litho (stone), pan (everything), and spermia (seeds) to explain the mechanism and scope.
The Lithopanspermia Gauntlet Of Hazards
- Successful transfer requires surviving a gauntlet: impact shock, vacuum, cold, radiation, atmospheric entry, and landing impact.
- Ramesh emphasizes the initial shock matters: rapid application of extreme pressure can be more lethal than sustained high pressure.
Shooting Bacteria With A Giant Impact Gun
- Ramesh and grad student Lily Zhao built a steel-plate "sandwich" with bacteria between plates and shot another plate into it using a giant impact gun.
- The gun drove shockwaves into the plates, creating short-duration gigapascal pressures that mimic impact shocks.