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Comet NEOWISE appears as a string of fuzzy red dots crossing through the constellation Puppis in this composite image that combines multiple exposures taken by the NEOWISE mission on March 27. The comet appears red in this heat-sensitive infrared image be (Image: University of Arizona/NASA/Jet Propulsion Laboratory) Comet NEOWISE appears as a string of fuzzy red dots crossing through the constellation Puppis in this composite image that combines multiple exposures taken by the NEOWISE mission on March 27. The comet appears red in this heat-sensitive infrared image because it is much cooler than the background stars, which are thousands of degrees.