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Update for 4:10 p.m. ET Nov. 28: The comet may have fizzled, but scientists say sun-watching satellites are still seeing the dust left over from ISON swing around in a gravitational arc as it dissipates. "Dust continues to move around the orbit, just as it should," Pesnell told NBC News. The arc is visible in imagery from NASA's STEREO and SOHO satellites.