How Are We Looking For Alien Life?

It seems like every day, we discover more and more alien worlds orbiting distant stars. Is it possible for some of these planets to have life, and if so, how could we detect it?

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SETI: The Search for ExtraTerrestrial Intelligence
"Since the beginning of civilization, people have wondered if we are alone in the universe or whether there is intelligent life somewhere else."

SETI Institute
"The mission of the SETI Institute is to explore, understand and explain the origin, nature and prevalence of life in the universe."

The science of SETI@home
"SETI (Search for Extraterrestrial Intelligence) is a scientific area whose goal is to detect intelligent life outside Earth."

Search for extraterrestrial intelligence
"The search for extraterrestrial intelligence (SETI) is the collective name for a number of activities undertaken to search for intelligent extraterrestrial life."

Chlorofluorocarbons (CFCs)
"Chlorofluorocarbons (CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine."