the.com/panspermia
the idea that life didn't start here, it just moved in.
means a hypothesis that life or its chemical building blocks arrived on earth from elsewhere in space, via comets, meteorites, or cosmic dust.
from from greek pan meaning all and sperma meaning seed. the concept dates to ancient greek philosophers like anaxagoras, but it got scientific teeth in 1908 when svante arrhenius proposed microbial spores drifting through space on radiation pressure alone.
famous backerfrancis crick, co-discoverer of dna, took it seriously
tardigradescan survive vacuum, radiation, and possibly interplanetary travel
meteorite evidencemurchison meteorite contains amino acids from space
directed versioncrick proposed aliens seeded earth deliberately