Discovering life elsewhere: How can we be sure?
Planetary Radio: Space Exploration, Astronomy and Science
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Methane on Mars - What's Next?
We believe from the maps we see from earth, that methane is coming from a number of areas. We don't really have a local map of where it might be leaking. And so an additional type of measurement might be to look at the isotopic signature of that methane. Depending on both the hydrogen and carbon stable isotope assessment, thit could further suggest biology. The methan could have been generated in ancient times too, and is being released through the surface for a variety of reasons.
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