▪ Abstract Astrobiology is the study of the living universe. Astronomy provides the context for
the origin and evolution of life on Earth. Conversely, discoveries about the terrestrial …

Living systems produce more than 90% of Earth's atmospheric methane; the balance is of
geochemical origin. On Mars, methane could be a signature of either origin. Using high …

We report a detection of methane in the martian atmosphere by the Planetary Fourier
Spectrometer onboard the Mars Express spacecraft. The global average methane mixing …

Using the Fourier Transform Spectrometer at the Canada–France–Hawaii Telescope, we
observed a spectrum of Mars at the P-branch of the strongest CH4 band at 3.3 μm with …

Methane (CH 4) on Mars has attracted a great deal of attention since it was first detected in
January 2003. As methane is considered a potential marker for past/present biological or …

Evidence is reviewed which supports the hypothesis that prokaryotes and eukaryotes may
have colonized Mars. One source of Martian life, is Earth. A variety of species remain viable …

We evaluate, based on terrestrial analogs, the potential flux, origin and isotopic signature of
methane (CH4) from serpentinized or serpentinizing rocks on Mars. The Tekirova ophiolites …

Recent spectroscopic detections of CH4 in the atmosphere of Mars are the first definitive
observations of an organic compound on that planet. The relatively short photochemical …

We report airborne measurements of the column abundance of atmospheric methane made
over an altitude range of 3–11 km using a direct detection integrated-path differential …

Biological molecules exhibit homochirality and are optically active. Therefore, it is possible
that the scattering of light by biological molecules might result in a macroscopic signature in …