Panspermia is a Greek word that translates literally as “seeds everywhere”. The panspermia hypothesis states that the “seeds” of life exist all over the Universe and can be propagated through space from one location to another. Some believe that life on Earth may have originated through these “seeds”.
More interesting reading may be found in each of the following that will open in a new browser window if you click onto their titles:
Panspermia from Wikipedia, The Free Encyclopedia
Cosmic Ancestry, Life comes from space because life comes from life
Promethian panspermia from Roger Ebert’s Journal