CO Ice in Protoplanetary Disks (IMAGE) Center for Astrophysics | Harvard & Smithsonian Caption Artist’s illustration of a planetary disk, a region of dust and gas where planets form. The zoom-in insert displays carbon monoxide molecules in the ice phase. Credit Credit: M.Weiss/Center for Astrophysics | Harvard & Smithsonian Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. License CC BY-NC Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.