The most carbon dioxide-rich comets ever seen 😮☄️ Astronomers have been observing 3I/ATLAS since July, when it was discovered to be zipping towards our solar system with extreme speed. Most observations so far have found that it appears to be a fairly regular comet, though there have been some puzzling features hinting at an exotic origin. Martin Cordiner @NASA Goddard Space Flight Centre in Maryland and his colleagues have now obtained the most detailed observations of the comet yet using the