Panspermia is the hypothesis that life exists throughout the Universe, distributed by meteoroids, asteroids, and planetoids.
Panspermia proposes that life that can survive the effects of space, such as extremophile bacteria, become trapped in debris that's ejected into space after collisions between planets that harbor life and Small Solar System Bodies
(SSSB). Bacteria may travel dormant for an extended amount of time
before colliding randomly with other planets or intermingling with protoplanetary discs. If met with ideal conditions on the new planets' surfaces, the bacteria become active and the process of evolution begins. Panspermia is not meant to address how life began, just the method that may cause its sustenance.