The fourth episode of Cosmos: A Spacetime Odyssey, “A Sky Full of Ghosts,” airs tonight on Fox.In “A Sky Full of Ghosts,” Neil deGrasse Tyson sets off on the Ship of the Imagination to explore how light, time and gravity alter our perception of the universe. Travel back in time to 1809, when astronomer William Herschel (guest voice Stewart) observes how light plays tricks with time and gravity. Later, Tyson embarks on an exhilarating journey to the event horizon of a black hole.Neil deGrasse Tyson hosts.Guest voices include Patrick Stewart as William Herschel and Julian Ovenden as Michael Faraday.Cosmos: A Spacetime Odyssey, “A Sky Full of Ghosts,” airs Sunday, March 30 at 9:00 PM ET on Fox.
