S.A. Benner et al., The missing organic molecules on Mars. Proc. Nat. Acad. Sci USA 97, 2425-2430 (2000)
B. Bézard, C. de Bergh, D. Crisp, J.-P. Maillard, The deep atmosphere of Venus revealed by high-resolution nightside spectra. Nature 345, 508-511 (1990)
O. Botta, J.L. Bada, Extraterrestrial organic compounds in meteorites. Surv. Geophys. 23, 411-467 (2002)
P. Coll et al., Experimental laboratory simulation of Titan's atmosphere: Aerosols and gas phase. Planet. Space Sci. 47, 1331-1340 (1999)
J.R. Cronin, S. Chang, Organic matter in meteorites: Molecular and isotopic analyses of the Murchison meteorite, in Chemistry of Life's Origins, ed. by J.M. Greenberg, V. Pirronello (Kluwer, Dordrecht, 1993), pp. 209-258
Encrenaz, Space Sci. Rev. (2008, this issue)
Eigenbrode, Space Sci. Rev. (2008, this issue)
V. Formisano, S.K. Atreya, T. Encrenaz, N. Ignatiev, M. Giuranna, Detection of methane in the atmosphere of Mars. Science 306, 1758-1761 (2004)
Fridlund, Space Sci. Rev. (2008, this issue)
Gogarten et al., Space Sci. Rev. (2008, this issue)
H.J. Hofmann, Archean microfossils and abiomorphs. Astrobiology 4, 135-136 (2004)
H.P. Klein, Automated life-detection experiments for the Viking mission to Mars. Origins of Life 5, 431-441 (1974)
H.P. Klein, The Viking Biological Investigation: General aspects. J. Geophys. Res. 82, 4677-4680 (1977)
A.H. Knoll, S. Golubic, Proterozoic and living cyanobacteria, in Early Organic Evolution: Implications for Mineral and Energy Resources, ed. by Schidlowski et al. (Springer, Berlin, 1992), pp. 450-462
V.A. Krasnopolsky, J.-P. Maillard, T. Owen, Detection of methane in the Martian atmosphere: evidence for life? Icarus 172, 537-547 (2004)
Krumbein, Space Sci. Rev. (2008, this issue)
Mahaffy, Space Sci. Rev. (2008, this issue)
C.P. McKay, What is life - and how do we search for it on other worlds? Public Libr. Sci. Biol. 2, 1260-1263 (2004)
McKay, Space Sci. Rev. (2008, this issue)
D.S. McKay et al., Search for past life on Mars: Possible relic biogenic activity in Martian meteorite ALH84001. Science 273, 924-930 (1996)
S.J. Mojzsis et al., Evidence for life on Earth before 3,800 million years ago. Nature 384, 55-59 (1996)
M.J. Mumma et al., Detection and mapping of methane and water vapor on Mars. Bull. Am. Astron. Soc. 36, 1127 (2004)
H.B. Niemann et al., The abundances of constituents of Titan's atmosphere from the GCMS instrument on the Huygens probe. Nature 438, 779-784 (2005)
Ono, Space Sci. Rev. (2008, this issue)
S.T. Petsch, K.J. Edwards, T.I. Eglinton, Microbial transformations of organic matter in black shales and implications for global biochemical cycles. Paleogeogr. Paleoclimate Paleoecology 219, 157-170 (2005)
Raulin, Space Sci. Rev. (2008, this issue)
Seager, Space Sci. Rev. (2008, this issue)
M.A. Sephton, Organic compounds in meteorites. Nat. Prod. Rev. 19, 292-311 (2002)
M.A. Sephton, O. Botta, Recognising life in the solar system: Guidance from meteoritic organic matter. Int. J. Astrobiol. 4(3-4), 269-276 (2005)
Sephton, Botta, Space Sci. Rev. (2008, this issue)
Schuerger, Clark, Space Sci. Rev. (2008, this issue)
S.W. Squyres et al., In situ evidence for an ancient aqueous environment at Meridiani Planum, Mars. Science 306, 1709-1714 (2004)
Summons et al., Space Sci. Rev. (2008, this issue)
Turnbull, Space Sci. Rev. (2008, this issue)
M.A. Van Zuilen, Space Sci. Rev. (2008, this issue)
M.A. Van Zuilen, A. Lepland, G. Arrhenius, Reassessing the evidence for the earliest traces of life. Nature 418, 627-631 (2002)