Due to the limitations presented by our culture's fledgling space travel technology, simply going to a planet orbiting another star isn't a practical way of determining whether or not there's any life there. Instead, researchers are using indirect methods of looking for extra-solar life, such as the conditions presented by the planet's host star in relation to it's orbit, the presence of an atmosphere, temperature, and so on. Now, a research team has devised a list of signature gases that astronomers can look for, that might be produced when a potential extraterrestrial organism metabolizes.
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