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"The fact that we can see it is really what makes it unique. There may be no impact threat from Comet NEOWISE, but there is a "wow" factor for skywatchers who see it, Kramer said. "It's very far away from us and it's not coming anywhere near us, so there is no threat." "There is no risk to the planet from this," he added. (Image credit: Gianluca Masi/ The Virtual Telescope Project) The International Space Station seems to cross paths with Comet NEOWISE in the morning sky over Rome, Italy, in this photo captured by astrophysicist Gianluca Masi of the Virtual Telescope Project, on July 7, 2020. "It's about 13 million Olympic swimming pools of water," she added. "This comet is about 3 miles across, and most comets are about half water and half dust," said NEOWISE science team co-investigator Emily Kramer of NASA's Jet Propulsion Laboratory, who used that statistic to calculate just how much water is in Comet NEOWISE.
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A second tail made of ionized particles blown back from the comet's head (called its "coma") by the solar wind can be seen in some photos. The light from the comet is sunlight reflecting off the dazzling tail of gas and dust trailing away from NEOWISE as it drifts ever farther from the sun. Since then, the comet has been spotted by several space telescopes and observatories, astronauts on the International Space Station and, of course, stargazers on Earth. Officially known as C/2020 F3, Comet NEOWISE was first discovered in March by the infrared-optimized NEOWISE spacecraft (the name is short for Near-Earth Object Wide-field Infrared Space Explorer).