Fascinating topic. Enjoy. Cyanobacteria not of this world???????????
The link is actually to 20 or so peer comments on the paper by Hoover, which was 10 years in the making.
Some my find these snippets easier to digest than the paper itself (which I'll post later)
Warning: The Journal of Cosmology does tend to be a little "out there" (no pun intended) to many hard core sceintists. That said, Hoover's paper is out there for full "peer review" and while given the "evidence" with which to work one will can never 100% certain, it is plausible and has some backing to it. Also, the comments of the 20 sceintists are skewed in a panspermia-friendly direction.
Richard Hoover of NASA has discovered evidence of microfossils similar to Cyanobacteria, in freshly fractured slices of the interior surfaces of the Alais, Ivuna, and Orgueil CI1 carbonaceous meteorites. Based on Field Emission Scanning Electron Microscopy (FESEM) and other measures, Hoover has concluded they are indigenous to these meteors and are similar to trichomic cyanobacteria and other trichomic prokaryotes such as filamentous sulfur bacteria. He concludes these fossilized bacteria are not Earthly contaminants but are the fossilized remains of living organisms which lived in the parent bodies of these meteors, e.g. comets, moons, and other astral bodies (JournalofCosmology.com March, 2011).