The NASA/ESA Hubble Space Telescope has photographed the farthest-discovered active inbound comet, C/2017 K2 (PANSTARRS). The comet’s orbit indicates that it came from the Oort Cloud, a spherically shaped reservoir almost a light-year in diameter containing leftovers from the formation of our Solar System 4.6 billion years ago. This Hubble image shows a fuzzy cloud of dust, called a coma, surrounding the comet C/2017 K2 PANSTARRS (K2), the farthest...