阿特拉斯彗星与大星系
2020 March 21 Comet ATLAS and the Mighty Galaxies Image Credit & Copyright: Rolando Ligustri (CARA Project, CAST) Explanation: Comet ATLAS C/2019 Y4 was discovered by the NASA funded Asteroid Terrestrial-impact Last Alert System, the last comet discovery reported in 2019. Now growing brighter in northern night skies, the comet’s pretty greenish co...