David Grinspoon Senior Scientist: Planetary Science Institute Astrobiology Chair: US Library of Congress (2012-2013) Author: Lonely Planets: The Natural Philosophy of Alien Life Author: Chasing New Horizons (w/Alan Stern)

How will humanity first discover ET Life? There will be a class of exoplanets whose atmospheres are so undeniably strange, in ways that seem to defy geochemical explanation, that they will demand a biological explanation.  A strange disequilibrium mixture of atmospheric gasses that only make sense when *bio*geochemistry is invoked.

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