Lecture 24: Is There Other Intelligent Life in the Universe?

"Sometimes I think we're alone. Sometimes I think we're not. In either case, the thought is staggering."

-- Buckminster Fuller

To put the cosmos in perspective, click here and follow the slide show.

How did life evolve on Earth?

So, life adapts to suit its environment -- the successful (not necessarily the best!) adaptations continue, the unsuccessful ones disappear.

Let's concentrate on life close to what we know
(as it's hard to imagine everything we don't know!)...

So, Are We Alone?

Carbon-Based Life

How Do We Find Other Intelligent Life?

To learn about the physics of interstellar travel, click here.

The Drake Equation

To read an interview with Frank Drake, click here.

To make your own estimate of the probability of other intelligent life using the Drake equation, click here.