AS 209 (IMAGE) National Radio Astronomy Observatory Caption AS 209 is a young star in the Ophiuchus constellation that scientists have now determined is host to what may be one of the youngest exoplanets ever. Credit ALMA (ESO/NAOJ/NRAO), A. Sierra (U. Chile) Usage Restrictions Credit required. License Original content 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.