C/2020 F3 NEOWISE, also called Comet NEOWISE, was first spotted in late March of 2020 by NASA's Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE) mission. According to NASA, the comet's nucleus is about 3 miles in diameter and composed of dust, rock and frozen gases left over from the birth of our solar system around 4.6 billion years ago.
NASA's Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE) mission discovered the comet on March 27, 2020, using its two infrared channels, which are sensitive to the heat signatures given off by the object.
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