NASA could look for aliens by searching for pollution in exoplanets' atmospheres
A new study from NASA has shown that scientists could begin observing the atmosphere of other planets for NO2. Ravi Kopparapu of NASA's Goddard Space Flight Center in Greenbelt, Maryland, said: "On Earth, most of the nitrogen dioxide is emitted from human activity—combustion processes such as vehicle emissions and fossil-fueled power plants. "In the lower atmosphere (about 10 to 15 kilometres or around 6.2 to 9.3 miles), NO2 from human activities dominate compared to non-human sources. "Therefore, observing NO2 on a habitable planet could potentially indicate the presence of an industrialis...
Source: express.co.uk