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Sarah Johnson has taken an Assistant Professor position at Georgetown University.

Sarah Stewart Johnson is a planetary scientist who also writes broadly on issues related to science and society.  Her scientific research focuses on the evolution of planetary environments, particularly with regard to the prospects for life on ancient Mars.   She has completed field seasons in Antarctica, Australia and Madagascar, conducted research at the Niels Bohr Institute in Copenhagen, and worked at mission control for the NASA Opportunity and Spirit Mars Rovers. 

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