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A widely accepted theory explaining the formation of Earth’s moon is a collision with another rocky planet about the size of Mars that created a partially vaporized disk around Earth which eventually formed a satellite with a radius more than one-quarter of Earth’s. While other planets in our solar system have moons, only ours is. Read more » ....
Ravi Kopparapu, who works at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, and is the lead author of the study, explained this further, “On Earth, most of the nitrogen dioxide is emitted from human activity combustion processes such as vehicle emissions and fossil-fueled power plants,” adding, “In the lower atmosphere (about 10 to 15 kilometers 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 industrialized civilization.” With more than 4,000 exoplanets found so far, experts are eager to find out if any of them host other civilizations but since they are so far away from us, the only way we can search for signs of life is with powerful telescopes that can find out what’s in their atmospheres. ....