NASA: We should look for polluted planets if we want to find smart ETs

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And you shall know them by the pollution in their skies: A team of NASA-funded researchers may have developed a new method for sussing out intelligent extraterrestrial life. TL;DR: It’s nitrogen-dioxide. Up front: Finding evidence of intelligent extraterrestrial life in an infinite universe is, perhaps, the most monumental undertaking a scientist can endeavor to. In order to narrow the field down from trillions of stars, we need search filters. The NASA-funded team decided to look for signs of technology using our own planet’s unique atmospheric condition as inspiration. According to the researchers: The history of life on Earth provides a…

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