Giant Comet Will Make Its Closest Approach to Earth —

A massive comet will make its closest approach to Earth this year. (Photo : NASA, ESA, and D. Jewitt (UCLA))This Hubble Space Telescope image shows a fuzzy cloud of dust, called a coma, surrounding the comet C/2017 K2 PANSTARRS (K2), the farthest active comet ever observed entering the solar system.

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