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Fishermen who know exactly what they’re looking for generally use a single line with a specific bait to lure the fish they want. Fishermen who don’t know what they’re looking will often conduct a wide sonar scan hoping to identify any and all kinds of fish and where they’re hiding so they can then assess
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 ...