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Loading contentSigns of life on a surface — pigments, the 'red edge' reflectance of vegetation, or patterns and textures a biosphere leaves behind — sought both on exoplanets and on the surface of Mars.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.