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Astronomer, planetary scientist, cosmologist, astrophysicist, astrobiologist, science communicator, author, and professor. Known for research on the possibility of extraterrestrial life, assembly of the Pioneer plaque and the Voyager Golden Record, and advocating for the greenhouse effect hypothesis on Venus.
Theoretical physicist known for his work in the path integral formulation of quantum mechanics, theory of quantum electrodynamics, and the physics of superfluidity. Nobel Prize recipient for his contributions to the development of quantum electrodynamics.