NOVA | scienceNOW | The Search for ET

Astronomers have their radio telescopes tuned to receive signals from alien worlds. But is anybody out there?

Explore the arguments in our interactive poll, then cast your vote.

Try your hand at calculating how many intelligent, communicating civilizations might be in our galaxy.

Seth Shostak, Senior Astronomer at the SETI Institute and perhaps the funniest man in astrobiology, tackles your questions.

What would aliens conclude about intelligent life on our planet if they picked up our broadcast signals?

Find out how you can help SETI from the comfort of your own home.

Seth Shostak holds out hope that we will one day receive a signal from afar.

The Search for ET