Mercury ’s Caloris Basinis seen in anenhanced color mosaic . The massive crater , formed some 4 billion years ago , is orange . minor craters made later are submit in blue , while orange splotch around the circumference may be volcanic vents .
( Side note : Props to the punster who titled the photo “ All About that Basin ” on the Jet Propulsion Laboratory ’s Photojournal Thomas Nelson Page . )
Credit : NASA / Johns Hopkins University Applied Physics Laboratory / Arizona State University / Carnegie Institution of Washington
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