Greatest Discoveries with Bill Nye: Astronomy DVD

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Bill Nye covers Albert Einstein's theory of general relativity, demonstrates how Hubble determined that the universe is expanding, and discusses the twentieth-century advancements that help us understand gamma ray bursts, black holes, pulsars, and quasars.

Other highlights include Edmond Halley, whose discovery of comets orbiting the Sun proved that gravity works in space, and Alexander and Caroline Herschel, whose map of the sky brought about new understanding of our universe. Close-captioned. 45 minutes. 2005.