The planned ExoMars Trace Gas Orbiter, to be launched on 2016, will implement this approach and will focus on detection, characterization of spatial and temporal variation, and localization of sources for a broad suite of atmospheric trace gases on Mars and help determine if their formation is of biological or geological origin.
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Mars Pathfinder's Sojourner rover and the Mars Exploration Rovers each used this landing technique successfully.
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While the majority of astrobiologists still conclude that the Viking biological experiments were inconclusive or negative, Gilbert Levin is not alone in believing otherwise.
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