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Physicist Amelia Sparavigna of Politecnico di Torino in Italy found a 6-mile-wide crater in the Bayuda desert in Sudan using Google Maps, a free astronomical image-processing program she helped develop called AstroFracTool, and open source image-processing tool GIMP. The work appeared on ArXiv Aug. 3.
While no one has gone to the Bayuda crater site to confirm that it was formed by a meteor impact, the discovery demonstrates that with freely available software and a lot of spare time, anyone can become part of the search for craters.
As of today, there are about 175 confirmed craters on Earth caused by the impact of material from space, according to the Impact Database maintained by geologist David Rajmon.