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COSMOS: A SPACETIME ODYSSEY: Host Neil deGrasse Tyson tells the story of the man who first discovered the mysterious existence of cosmic rays in the all-new “Unafraid of The Dark” Season Finale episode of COSMOS: A SPACETIME ODYSSEY airing Sunday, June 8 (9:00-10:00 PM ET/PT) on FOX and Monday, June 9 (9:00-10:00 PM ET/PT) on Nat Geo.