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One of Stephen Hawking's most famous adversaries shares the story of how their relationship began.
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Space ships that travel near light speed, black holes, wormholes, and more, explored by Stephen Hawking as he ponders the possibilities of time travel.
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Stephen Hawking believes there could be life beyond Earth, all through the universe. Find out what he thinks they may look like.
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Stephen Hawking talks about the mysteries of the universe and how the secrets of Space may change our future.
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Find out about the beginning of the universe, creation of stars, black holes, and the genesis of life, not to mention the end of the world.
The Science Channel Clips
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Humans vs AliensDr. Michio Kaku disagrees with Hollywood's idea that a battle between humans and aliens would be like David vs. Goliath. In his scientific view, it would be more like Bambi vs. Godzilla!Through the Wormhole (01:33)
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Sneak PeekCountless mysterious objects have been caught by NASA's cameras. Many astronauts have even reported seeing unidentified flying objects. Has NASA recorded the first traces of extraterrestrial life?NASA's Unexplained Files (00:31)
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The Discovery of PenicillinPenicillin was one of medical sciences biggest breakthroughs.100 Greatest Discoveries (02:14)
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The SunWhat might life look like once the Sun is gone?Space School (05:03)
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Predators from SpaceSome scientists propose that the concept of a "food chain" applies to life beyond our own planet. If we ever do meet with alien visitors, we'd better hope they're not hungry!Through the Wormhole (02:24)
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UranusPowerful ice storms and an upside-down ring system are just a few things that puzzle scientists today.Space School (05:22)
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Space & SexWho says space and sex don't go together? Not SCI! Watch the best of SCI's space programming starting at 9AM E/P, followed by the hottest in sex science starting at 8PM E/P!Science Channel Sneak Peeks (00:30)
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Something Out ThereJames McDivitt, a NASA astronaut and engineer in the 1960's, reported he saw and filmed a strange object in space. Is there a logical explanation or was there really something out there?NASA's Unexplained Files (01:46)
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The Condon ReportThe U.S. Air Force created the Condon Report in 1968 to address supposed UFO sightings. The report stated that "further extensive study of UFO's probably cannot be justified" and is seen by some as an attempted government cover up.NASA's Unexplained Files (01:55)
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EarthEarth remains a complex and fragile planet, unique in almost every way.Space School (06:26)
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PlutoAt 3.7 billion miles from the Sun, the dark world of Pluto has remained a puzzle to scientists.Space School (04:29)
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Cosmic RadiationThrough his hot air balloon experiments, physicist, Victor Hess discovers the phenomenon and effects of cosmic radiation.100 Greatest Discoveries (01:23)
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Stephen Hawking explores time, space, the universe, alien life, and all your favorite science (and science fiction) phenomena.
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