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Loading contentCarl Sagan was a planetary scientist and the most influential science communicator of his time. He contributed to NASA's planetary missions, modelled the greenhouse climate of Venus and 'nuclear winter', and through his book and series Cosmos brought the wonder of the universe to hundreds of millions of people.
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.
General reference for the history of astronomy, biographies, and cultural context.