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.

Return to 100th Anniversary Page