The Chance of Finding Aliens
In 1961 the Drake Equation launched the search for other civilizations among the stars. How does the quest look today? What is the chance of finding aliens?

SETI Searches Today
Several big hunts are seeking radio and laser emissions from other civilizations. From Southern SERENDIP to SETI@home, here's a complete rundown of all the searches now under way.

The Future of SETI
Searches for extraterrestrial intelligence are expanding into new realms, thanks to new advances in technology — and new thinking.

Smarter SETI Strategy
Why some of the biggest searches should reverse their strategy — and why the first signal we hear will come from an unusually powerful civilization unusually far away.

The Allen Telescope Array: SETI's Next Big Step
SETI researchers have long had to beg time on instruments built for conventional radio astronomy. Now they're building one of their own.

Habitable Moons
What does it take to make a liveable world? A stable orbit, an atmosphere, liquid water, and a climate regulated by plate tectonics. Big moons of giant planets might qualify.

Why No SETI Signals Yet?
In a symposium at Harvard, searchers for life in the universe concluded that we've got a long, long way to go.

Optical SETI Takes a Big New Leap
In April 2006, the world's largest optical SETI telescope prepared to begin sweeping tens of millions of stars for laser signals.