Interstellar comet 3I ATLAS glows green during lunar eclipse | Space photo of the day for Sept. 15, 2025

Strange Green Glow From Interstellar Comet 3I/ATLAS Has Scientists Puzzled

Images of interstellar comet 3I/ATLAS snapped during the September 7 total lunar eclipse seem to suggest that the latest visitor to the Solar System may be turning green. That's not all that strange for a comet. Many Solar System comets give off a green glow when they heat up enough to emit vapor. However, for 3I/ATLAS, it might be quite strange: observations of the comet's chemistry obtained to date show very few signs of the dicarbon (C2) mole…

Interstellar comet 3I ATLAS glows green during lunar eclipse | Space photo of the day for Sept. 15, 2025

NASA is collaborating with the Colorado Army National Guard at its training center in Gypsum to help Artemis astronauts prepare for moon landings.