Answer:
Panspermia (from Ancient Greek πᾶν (pan) 'all', and σπέρμα (sperma) 'seed') is the hypothesis that life exists throughout the Universe, distributed by space dust,[1] meteoroids,[2] asteroids, comets,[3] planetoids,[4] and also by spacecraft carrying unintended contamination by microorganisms.[5][6][7] Distribution may have occurred spanning galaxies, and so may not be restricted to the limited scale of solar systems
