That our universe is infinite in size, finite in age, and just one among many. Not only can I not prove it but I believe that these statements will prove to be unprovable in principle and we will eventually hold that principle to be self-evident.

Published on *Edge.org* (http://edge.org)

Cosmologist, Cambridge University; Author, The Infinite Book

**Links:**

[1] http://edge.org/annual-question/what-do-you-believe-is-true-even-though-you-cannot-prove-it

[2] http://edge.org/inthenews/what-do-you-believe-is-true-even-though-you-cannot-prove-it

[3] http://edge.org/contributors/what-do-you-believe-is-true-even-though-you-cannot-prove-it

[4] http://edge.org/responses/what-do-you-believe-is-true-even-though-you-cannot-prove-it

[5] http://edge.org/print/response-detail/11281

[6] http://edge.org/memberbio/john_d_barrow