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Are We Alone in the Universe

Asteroids - The Good, The Bad, The Ugly »

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Are We Alone in the Universe

 Search for Extra-Terrestrial Intelligence (SETI) is the collective name for a number of activities people undertake to search for intelligent extraterrestrial life. SETI projects use scientific methods to search for electromagnetic transmissions from civilizations on distant planets. The United States government contributed to earlier SETI projects, but recent work has been primarily funded by private sources. There are great challenges in searching across the cosmos for a first transmission that could be characterized as intelligent, since its direction, spectrum and method of communication are all unknown beforehand. SETI projects necessarily make assumptions to narrow the search, and thus no exhaustive search has been conducted so far.

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