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Eric J. Chaisson is an American astrophysicist and science educator best known for his research, teaching, and writing on the interdisciplinary science of cosmic evolution. (Closely related subjects include epic of evolution, big history, and astrobiology). He is also noted for his original research on the interstellar clouds and emission nebulae of the Milky Way Galaxy, and for his leadership in improving science education nationally and internationally. He is currently a staff member of the Harvard-Smithsonian Center for Astrophysics and teaches natural science at Harvard University.
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