Why the Universe is Flat I The Great Courses





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Published on Jun 21, 2012

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In this video lecture, Neil deGrasse Tyson, America's most noted astrophysicist, discusses how the shape of the universe allows us to bypass questions about the "original source of energy that begat the universe."

This is an excerpt of The Inexplicable Universe: Unsolved Mysteries, a series of online courses presented by Dr. Tyson in Hayden Planetarium, American Museum of Natural History.

If you add together the three kinds of things that occupy the universe, the familiar matter, the dark matter, and the dark energy, each creates a curvature of the fabric of space and time, just as prescribed by Einstein's general theory of relativity. If you add those curvatures together, they create a universe that is perfectly flat. The universe is not saddle shaped, having net positive energy, nor spherical, having net negative energy. The entire universe, being flat, has zero net total energy.

The universe is an incredible place. And this is your chance to explore it, one-on-one, with Neil deGrasse Tyson, America's most renowned science educator.

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