Is there other life in the universe? How do we find out? What is the protocol if we discover extraterrestrials? Experts weigh in.

Jill Tarter, co-founder of the SETI Institute, lists the scientific reasons why it is plausible for other life forms to exist in the Universe.

Are We Alone In The Universe?

Michael Summers, Professor of Planetary Science & Astronomy at George Mason University, explains how creatures that survive in extreme conditions on earth give us a broader perspective on what's possible elsewhere.

Extremophiles

Jill Tarter, co-founder of the SETI Institute, explains the technology behind artificial looking radio waves.

How Do Radio Wave Signals Look Engineered?

Jill Tarter, co-founder of the SETI Institute, debates the merits of transmitting signals to outer space. If we receive a response, who speaks for Earth?

If A Signal Is Detected, Who Replies?

Michael Summers, Professor of Planetary Science & Astronomy at George Mason University, wonders if alien life forms may be utterly different from life as we know it.

Life As We Imagine It

Jill Tarter, co-founder of the SETI Institute, describes the organization's historical search for extraterrestrial life.

SETI Has Been Listening A Long Time

Jill Tarter, co-founder of the SETI Institute, explains why the organization's role is that of universal historians.

SETI: The Archaeology Of The Future?

For Michael Summers, Professor of Planetary Science & Astronomy at George Mason University, the big surprise will be if we DON'T find alien life in the next 30 years.

The Mystery Of Life

Jill Tarter, co-founder of the SETI Institute, outlines the process that would occur, should SETI's goal of detecting life be successful.

What If An Alien Signal Is Detected?

Jill Tarter, co-founder of the SETI Institute, describes radio telescopes and their importance in the search for extraterrestrial life.

What Is A Radio Telescope?

Jill Tarter, co-founder of the SETI Institute, describes the purpose behind her livelihood.