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Long ago, our ancestors believed that if you sailed too far in one direction, you would fall off the edge of the world. Since then, humanity has been refining its idea of the cosmos. We grew to understand that the Earth was not the center of the Universe. Later, we realized the stars of the sky had planets of their own. On larger and larger scales, we saw structures within our Universe.

But is our Universe all that there is? Perhaps, once more, we are at the cusp of radically altering our idea of the cosmos. What if our Universe is only one of many? Such a hierarchy of universes, also known as the multiverse, is an idea that explains many of the physical traits of our Universe, and is supported by string theory and inflation.

If there are many universes, does this radically change, once more, how we understand our position within the cosmos? What does it mean philosophically, ethically, and spiritually, and could it even affect how we live our lives? Today we talk to Dr. Jerry Cleaver of Baylor University. Jerry studies string theory and the multiverse, but also loves tackling the philosophical conundrums that come along with it.
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