Astronomer Jill Tarter explains why SETI is really about technology, patience, and learning how to tell alien signals from our own.

"Asking the question of, "Where did the entire universe come from?" is no longer a question for poets and theologians and philosophers. This is a question for scientists, and we have some amazing scientific answers to this question."

"Asking the question of, where did the entire universe come from, is no longer a question for poets and theologians and philosophers. This is a question for scientists, and we have some amazing scientific answers to this question that have defied even the wildest of our expectations."

What drives the universe's expansion? Chemist Lee Cronin explains the theories linking time, space, and selection, providing a fresh perspective on this cosmic mystery.

Dispatches host Kmele Foster is on a journey to understand humanity’s role in the cosmos. His first stop? The Atacama Plateau in Northern Chile, home to the darkest deserts and largest telescopes on earth.