Astronomy & Space Science · Astrobiology
A topic within Astrobiology, itself one of 9 topics in that field and part of Astronomy & Space Science.
2 works
Svante Arrhenius
Proposes that microscopic spores are driven between star systems by radiation pressure alone, so life could spread through the galaxy without any vehicle or directing intelligence.
link checked 17 Sept 2026Paul S. Wesson
Works through the physics a spore would have to survive to cross interstellar space and concludes that radiation and transit times make unguided panspermia between star systems implausible, though transfer within a single planetary system remains workable.
link checked 17 Sept 2026