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Featured Videos, Photos & Interactives

• 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)

• 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)

• 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)

• 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)

• 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)

• 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

• The Universe: Another Earth
  The Universe: Another Earth

  Full Episode (45:00)

  Are we alone? Is there another Earth-like planet somewhere in the universe? Will we find it hidden in the billions of stars and planets out there?

  Full Episode (45:00)

• The Universe: Death Stars
  The Universe: Death Stars

  Full Episode (45:00)

  In the Star Wars universe, the Death Star is the ultimate weapon of mass destruction. In the actual universe, the sky is full of real-life death stars that could cause catastrophic damage to our planet if they explode.

  Full Episode (45:00)

• The Universe: It Fell From Space
  The Universe: It Fell From Space

  Full Episode (45:00)

  They appear out of nowhere, and threaten our very existence. From rocks crashing through homes to Mount Everest-sized boulders that could trigger mass annihilation, no one is safe from the wrath of the objects that are constantly falling from space.

  Full Episode (45:00)