Astrobiology Facts
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People have long speculated about the possibility of life in settings other than Earth, however, speculation on the nature of life elsewhere often has paid little heed to constraints imposed by the nature of biochemistry. The likelihood that life throughout the universe is probably carbon-based...
Astrochemistry extends chemistry into regimes of exceptionally low density and temperature and the impacts of debris left over from the formation of the solar system, in fact once brought prebiotic material to Earth. Since oceans arose from the arrival of icy comets, and carbon, nitrogen, and elemental metals were brought by asteroid impacts, these elements and others are necessary for life on Earth. Accordingly a new discipline, astrobiology, is coming into being.
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SETI has been a lengthy experiment in trying to detect our extraterrestrial equals or better somewhere out there by detecting their electromagnetic radio (sometimes optical or infrared) transmissions. Five decades on, the quarry remains elusive. My advice to SETI scientists ...











