Do stars and spaces go on forever? Do the numbers of galaxies, and even of universes, have no end? Is our universe infinite in size and contents? Are there an infinite number of independent universes? Are there different kinds of infinite universes? Can infinities be nested—infinities of infinities? Here’s how infinity transforms an astonishing reality.

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Ken Olum is a Research Professor in the Institute of Cosmology at Tufts University, where he has worked since 1997. He studies gravitational waves, cosmic strings, negative energies in quantum eld theory, energy conditions and exotic phenomena in general relativity, and anthropic reasoning and other issues in cosmology. He is a member of the NANOGrav collaboration, which searches for lowfrequency gravitational waves via precision timing of pulsars.

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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.