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Two asteroids crashed into Earth in the Carboniferous Period, leaving this distinctive pair of craters in northwestern Quebec.
NASA Earth Observatory images by Jesse Allen and Robert Simmon, using Landsat 8 data from the USGS Earth Explorer. Caption by Adam Voiland. Congratulations to Allen Pope (NSIDC), D Arseneault, and Lachezar Filchev for coming close to solving the puzzler and for providing interesting background information about the area.
Published November 23, 2013
Data acquired June 29, 2013