What is the ultimate fate of the Universe? The ultimate fate of

the Big Bang is either expansion to a maximum size followed

by re-collapse (the Big Crunch) or eternal expansion into a cold,

dark, disordered state (the Big Chill). Which of these is our

future depends on the current density of matter and energy in the

Universe, Omega0. This lecture examines our current knowledge of

the matter and energy content of the Universe, which leads to the

surprising discovery that we live in a Universe that

is Flat (Omega0=1), Infinite, and Accelerating! We will end the lecture

by exploring the possible fate of an infinite accelerating Universe.

Recorded 2006 March 2 in 1008 Evans Laboratory on the Columbus campus

of The Ohio State University.