The Universe

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What is a White Hole? (0:57)

We've all heard of black holes, but what exactly is a white hole?

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Ask The Universe

  • Other Dimensions
    Other Dimensions

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    Are there extra dimensions? If so, could there be space trapped inside?

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  • Can Antimatter Naturally Occur?
    Can Antimatter Naturally Occur?

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    Astrophysicist Alex Filippenko explores whether antimatter can naturally occur in the universe and explains what exactly a positron is.

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  • Matter or Energy: Which is More Plentiful?
    Matter or Energy: Which is More Plentiful?

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    Which is more abundant in the universe, matter or energy?

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  • What is the Volume of the Known Universe?
    What is the Volume of the Known Universe?

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    Ever wonder how immense the universe really is? Astrophysicist Alex Filippenko puts it in perspective.

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  • What Put the Bang in the Big Bang?
    What Put the Bang in the Big Bang?

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    Find out what most physicists believe caused the "bang" when the universe came into being.

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  • Faster Than Light Expansion
    Faster Than Light Expansion

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    Is it possible for the universe to expand faster than the speed of light, or would that violate Einstein's Theory of Relativity?

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  • Where Do Quasars Originate?
    Where Do Quasars Originate?

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    Accelerating nearly as fast as the speed of light, where exactly do quasar jets form?

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  • Exploding Star Chemicals
    Exploding Star Chemicals

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    Are heavy chemical elements produced by star explosions? If so, how do we know this?

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  • Solar Eclipses
    Solar Eclipses

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    Will solar eclipses eventually become a thing of the past? If so, when?

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  • What is a White Hole?
    What is a White Hole?

    Video Clip (0:57)

    We've all heard of black holes, but what exactly is a white hole?

    Video Clip (0:57)
  • What is Dark Energy?
    What is Dark Energy?

    Video Clip (0:59)

    What role does dark energy play in the universe? Astrophysicist Alex Filippenko describes a discovery that changed our understanding of how the universe works.

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  • Age of The Universe
    Age of The Universe

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    The universe is approximately 14 billion years old, but how have scientists determined this number? Astrophysicist Alex Filippenko fills us in.

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  • What Does "Expansion" Apply To?
    What Does "Expansion" Apply To?

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    Does the expansion of the universe apply to our bodies, Earth and the solar system? Astrophysicist Alex Filippenko explains.

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