Science has yet to prove that life exists on other planets, but it does allow us to speculate on the appearances of life forms on celestial bodies. Take a look at exobiology, the branch of biology that deals with the search for extraterrestrial life. This program is based on the compelling Discovery Channel presentation of "Alien Planet." Includes two segments.
* Life Beyond Earth — Introduces intelligent robots that have been designed to brave new worlds.
* Science Continues Its Search — Examines what these bionic explorers have already shown us — and what they may one day teach us about life outside our solar system.