The episode presented an in-depth treatment of black holes, beginning with John Michell's suggestion of the existence of an "invisible star" to the first discovery of a black hole, Cygnus X-1. It premiered on Maon Fox and on Maon National Geographic Channel. " A Sky Full of Ghosts" is the fourth episode of the American documentary television series Cosmos: A Spacetime Odyssey. Episode of Cosmos: A Spacetime Odyssey " A Sky Full of Ghosts"
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