...come from "Inner" space. This may give us new insights as to just how tough life is, especially since this isn't some exotic extremophile, but apparently, a normal oceanic plankton.
http://www.grindtv.com/outdoor/nature/post/sea-plankton-discovered-outside-space-station/
http://www.grindtv.com/outdoor/nature/post/sea-plankton-discovered-outside-space-station/