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Can Antimatter Naturally Occur?
Can Antimatter Naturally Occur?
Video Clip (0:58)
Astrophysicist Alex Filippenko explores whether antimatter can naturally occur in the universe and explains what exactly a positron is.
Video Clip (0:58)
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What Put the Bang in the Big Bang?
What Put the Bang in the Big Bang?
Video Clip (1:09)
Find out what most physicists believe caused the "bang" when the universe came into being.
Video Clip (1:09)
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Matter or Energy: Which is More Plentiful?
Matter or Energy: Which is More Plentiful?
Video Clip (1:01)
Which is more abundant in the universe, matter or energy?
Video Clip (1:01)
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Faster Than Light Expansion
Faster Than Light Expansion
Video Clip (1:06)
Is it possible for the universe to expand faster than the speed of light, or would that violate Einstein's Theory of Relativity?
Video Clip (1:06)
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Exploding Star Chemicals
Exploding Star Chemicals
Video Clip (1:02)
Are heavy chemical elements produced by star explosions? If so, how do we know this?
Video Clip (1:02)
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Solar Eclipses
Solar Eclipses
Video Clip (1:02)
Will solar eclipses eventually become a thing of the past? If so, when?
Video Clip (1:02)
Full Episodes
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The Universe: Asteroid Attack
The Universe: Asteroid Attack
Full Episode (45:00)
We've all heard of massive boulders hurtling toward our planet, but could we be heading straight into one instead? Find out whether President Obama is sending the next space mission to an asteroid.
Full Episode (45:00)
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The Universe Season 4 DVD
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