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Dr. Alan Guth unveils the theory of inflation.
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The Theory of Inflation
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Liquid water flows intermittently on the surface of Mars. In those streams, microbial life may have managed to arise.
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If There’s Water on Mars, Could There be Life?
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Scientists at the National Ignition Facility use lasers to create tiny fusion reactions, like those found in the sun.
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Making Fusion
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Explore one of the first planets discovered in another star's habitable zone.
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Cassini’s Final Moments
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Explore one of the first planets discovered in another star's habitable zone.
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Kepler 186f – An Earthlike World
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Should our first off-world colony be in orbit, on the moon, or on Mars?
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Where Should We Colonize First?
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Even this small asteroid which burned up in the atmosphere still destroyed property and injured 1,500 people.
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The Russian Meteor of 2013
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Astronomers combine visible light, infrared light, ultraviolet light, X-rays, and radio waves for a dazzling image.
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A Panchromatic View of the Galaxy
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Black Hole Collisions are the most powerful, violent events in the universe.
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When Black Holes Collide
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A Dyson sphere is a theoretical mega-structure that could only be built by an advanced civilization. Have astronomers discovered one?
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What's Passing in Front of This Star is Too Big to Be a Planet
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The Arecibo Message was a radio signal sent into space with information about Earth in the hope that alien intelligence could understand it -- and respond.
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02:14
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Space's Deepest Secrets
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Listen to the Message We Sent to Space
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If another civilization built a giant energy collector, we could detect it.
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Searching for Alien Technology
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Astronomers find a pulsar feeding off the gas of a nearby star.
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02:54
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A "Black Widow" Star is Devouring Its Neighbor
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Before heading into the solar system and beyond, get the latest weather conditions.
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01:17
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Your Planetary Weather Forecast
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Watch how these trillion-year stars "throw tantrums".
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01:58
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A Red Dwarf's Mega-Flare is More Powerful Than 100 Million Atomic Bombs
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Instead of lava, freezing water is believed to burst from Wright Mons on Pluto.
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The Ice Volcanoes of Pluto
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Jupiter’s Great Red Spot – the largest and longest-running storm in our solar system – is shrinking. Juan Lora, a planetary scientist at UCLA, explains why.
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This Is Why Jupiter’s Great Red Spot Is Shrinking
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Black Hole Collisions are the most powerful, violent events in the universe.
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Evidence shows that the Andromeda Galaxy is headed straight for our own. In the next few billion years, the two will collide. The Solar System will most likely be okay though.
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The Andromeda and Milky Way Galaxies Will Collide
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Instead of lava, freezing water is believed to burst from Wright Mons on Pluto.
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Is an ocean actually critical for life to survive? Does that ocean have to be made of water?
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Can Life Form Without Water?
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Photos from a zone on Mars called the Newton Crater are helping to shed light on the amount of water left on the planet. The moisture left is extremely salty, and possibly toxic to life forms.
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Water on Mars is Incredibly Salty
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Gravity from Jupiter and three neighboring moons twist Io's core, resulting in massive eruptions.
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Io is the Most Volcanic Planetary Body in the Solar System
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Methane is the primary ingredient in many of Saturn's moon's lakes and seas. Scientists designed a submarine that can withstand the volatile chemicals that will be found in these methane lakes.
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This Spacecraft Submarine Hybrid Will Explore Titan's Methane Lakes
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Dead stars called magnetars create fast radio bursts, giving us insights into dark matter dark matter.
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Massive Starquakes In Distant Galaxies Can Be Heard On Earth
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After Voyager 2 left Saturn, scientists noticed something wrong with the space probe's camera. To fix it from Earth, over a billion miles away, they had to come up with a creative solution.
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A simulation shows how the existence of habitable galaxies depends on dark matter.
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Dark Matter Binds The Universe Together
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The Family Portrait is an image of the Solar System acquired by Voyager 1 on February 14, 1990 from a distance of approximately 6 billion kilometers from Earth.
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Voyager 1 Took a Family Portrait of Our Solar System
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Astronomers find a pulsar feeding off the gas of a nearby star.
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Ion thrusters create small thrust levels in comparison to conventional chemical rockets, but achieve high specific impulse. They could be practical in the vacuum of space.
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This Thruster Can Propel a Spacecraft Almost Indefinitely
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Watch how these trillion-year stars "throw tantrums".
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