panspermia
Concise Oxford English Dictionary © 2008 Oxford University Press:
panspermia /panˈspəːmɪə/
▶noun the theory that life on the earth originated from microorganisms or substances present in outer space.
– origin C19: from Gk, from panspermos ‘containing all kinds of seed’.
'panspermia' also found in these Oxford entries:

