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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)
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The President’s Book of Secrets DVD
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