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We know our universe is expanding—this is one of humankind’s seminal discoveries. What caused such colossal expansion? We call it the Big Bang, but what were the forces involved? How do they work? What are the implications for understanding the cosmos? And why is the expansion of the universe accelerating? What does this hold for the future?

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Alan Harvey Guth is an American theoretical physicist and cosmologist. Guth has researched elementary particle theory (and how particle theory is applicable to the early universe). He is currently serving as Victor Weisskopf Professor of Physics at the Massachusetts Institute of Technology, and he is the originator of the inflationary universe theory.

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Closer to Truth, hosted by Robert Lawrence Kuhn and directed by Peter Getzels, presents the world’s greatest thinkers exploring humanity’s deepest questions. Discover fundamental issues of existence. Engage new and diverse ways of thinking. Appreciate intense debates. Share your own opinions. Seek your own answers.