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If advanced spacefaring aliens exploit resources like humans we'd better hope they don't find us anytime soon.
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Fearless junk science detractor Phil Plait explores what it would take for a deadly alien visitation to happen on Earth, as well as answer that age old question: Are we alone?
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65 million years ago, an asteroid bigger than Mount Everest slammed into the Earth wiping out the dinosaurs. Are we in for the same fate? Phil Plait investigates the possibility and tests some explosive measures that may just save our planet.
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Galaxies -- home to stars, planets and us -- come in all shapes and sizes. Witnesses the evolution of galaxies; from clouds of cold gas floating in the voids of space 13 billion years ago, to the magnificent spirals that fill our night sky.
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See all the fantastic alien life forms that Stephen Hawking believes may populate the universe.
Discovery Channel Clips
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The Big BangHow could something appear out of nothing? Explore the possibilities of how our universe came into existence with Stephen Hawking in this Curiosity video.Curiosity (02:04)
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Alien GrazersOn an Earth-like planet, a herd of alien herbivores grazes vertical cliff faces with the aid of specialized mouths and legs.Stephen Hawking's Universe (01:45)
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Solar System DestroyerA black hole passing through our solar sytem would overwhelm the sun's gravity, scatter moons, asteroids, and planets and devour everything in its path including our Earth.How the Universe Works (01:44)
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Alien HuntersPredators on a distant terrestrial planet must be fast and lethal just like their counterparts on Earth.Stephen Hawking's Universe (01:21)
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Colonizing MarsUsing perfectly foreseeable technology, humans may one day transform the Martian environment and establish colonies.Stephen Hawking's Universe (01:25)
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Our Interstellar FutureThe greatest challenge posed by trans-galactic exploration may be the re-engineering of human life spans to match the time required for travel between star systems.Stephen Hawking's Universe (03:06)
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Alien Invasion: Are We Ready?Curiosity continues with Alien Invasion: Are We Ready? Sunday, August 14, 2011 at 8PM e/p on Discovery.Curiosity (00:31)
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Birth of a Black HoleMost black holes probably form when supermassive stars collapse into a dense gravitational mass that absorbs all light.How the Universe Works (01:57)
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The WOW SignalOn August 16, 1977, a radio telescope in Ohio picked up the only signal that could have an alien source.Stephen Hawking's Universe (01:57)
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Gas Giant LifeOne possible form of extreme alien life may creatures that inhabit the dense atmospheres of gas giants.Stephen Hawking's Universe (01:27)
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Black Hole BirthdayWhen a star at least 20 times the size of our Sun runs out of fuel, nothing can stop the birth of a black hole.Stephen Hawking's Universe (02:20)
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Big StarsThe sun has been lighting our planet for 4.6 billion years and dominates all life on Earth -- but it's a speck in comparison to the other stars in the universe.How the Universe Works (01:33)
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If you are a space nut, then we have you covered! From interviews with Stephen Hawking to big bang theories, it's all here. So, start exploring with these out-of-this-world space videos.
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