The literature

Every source behind the panspermia article, what it measured, whether anyone here opened it, which way it cuts, and the sources considered and not used.

The larger catalogue for the whole series is on the parent page, the origin of life:  the literature.  Working notes are in abiogenesis/research/panspermia-and-meta.md.

Sources cited

Source What it is Access Direction
Crick & Orgel 1973, Icarus 19:341 Directed panspermia, including the rare-mineral answer to the relocation objection and the admission that the probability is unknown. Opened in full complicates
Chyba & Sagan 1992 Interplanetary dust as possibly the dominant source of prebiotic organics under a weakly reducing atmosphere. Opened undercuts
Mileikowsky et al. 2000 Mars-to-Earth transfer "not only possible but also highly probable" — with a conditional opening that is usually dropped. Opened; cross-checked against two databases complicates
Martins et al. 2008 Uracil and xanthine in Murchison at δ13C of +44.5‰ and +37.7‰ against a soil control at −10.6‰. Opened undercuts contamination claims
Wesson 2010 Interstellar transit leaves organisms "in a technically dead state." Opened supports
Rummel et al. 2011 The Surveyor III story dismantled: no negative control, one positive of thirty-three, seven weeks at room temperature, and film showing a bare forearm. Opened undercuts the panspermia claim
Behroozi & Peeples 2015 About 1020 Earth-like planets; the Solar System formed after 80% of them existed. Opened complicates
Sandberg, Drexler & Ord 2018 The uncertainty on the origin-of-life term spans roughly two hundred orders of magnitude, described by the authors as conservative. Opened disposes of confident probability claims
Furukawa et al. 2019, PNAS 116:24440 All four aldopentoses in Murchison and NWA 801 at 2.3-180 ppb, isotopically extraterrestrial. Opened in full undercuts
Kawaguchi et al. 2020 Three years of Deinococcus exposure on the space station; two to eight years extrapolated for a 1 mm pellet; the ~107-year typical transit. Opened in full complicates
Glavin et al. 2025, Nat Astron 9:199 The Bennu inventory: 33 amino acids, all five nucleobases, ~10,000 nitrogen-bearing species, and no nucleoside. Opened in full complicates
Furukawa et al. 2025 Sugars including ribose in Bennu, reported December 2025. Metadata and abstract undercuts

Considered and not used

  • Hoyle and Wickramasinghe's panspermia writings. Never read here. Their probability arithmetic is handled in the biological information article, where the figure is traced through two hostile witnesses rather than to them.
  • The interstellar-object literature on 'Oumuamua and its successors. Not relevant to the chemistry and not opened.
  • Mars meteorite ALH84001. The 1996 biogenicity claim and its rebuttals are a separate topic; nothing in this article depends on it.
  • Wickramasinghe's more recent claims about viruses arriving from space. Not engaged; they are not part of the mainstream transport literature this article uses.
  • Kawaguchi's 2020 transit-time citations to Mileikowsky 2000 and Frösler 2017. The ~107-year figure is sourced through Kawaguchi, and the underlying papers were not opened for that number.

Open questions

  1. Whether any nucleoside has been reported from any extraterrestrial sample. A search found none, and this negative carries a lot of weight in the article, so it should be re-checked before publication.
  2. The Furukawa 2025 Bennu sugar report was used from its abstract. The full paper should be read before the fifteen-parts-per-billion figure is printed anywhere else.
  3. Whether the rare-catalytic-mineral hypothesis has ever been given a concrete candidate. Fifty-three years on, none was found.