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COSMOS: A SPACETIME ODYSSEY: Host Neil deGrasse Tyson travels to to Australia to see the stars as clearly as our ancestors must have seen them in the all-new "The Sisters of The Sun" episode of COSMOS: A SPACETIME ODYSSEY airing Sunday, April 27 (9:00-10:00 PM ET/PT) on FOX and Monday, April 28 (9:00-10:00 PM ET/PT) on Nat Geo.