Newly Discovered Exoplanet GJ 504b (IMAGE) NASA/Goddard Space Flight Center Caption Glowing a dark magenta, the newly discovered exoplanet GJ 504b weighs in with about four times Jupiter's mass, making it the lowest-mass planet ever directly imaged around a star like the sun. Credit NASA's Goddard Space Flight Center/S. Wiessinger Usage Restrictions None License Licensed 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.