Planets Abound (IMAGE) California Institute of Technology Caption Caltech-led astronomers estimate that there are at least 100 billion planets in the Milky Way galaxy. Credit NASA; ESA; Z. Levay and R. van der Marel, STScI; T. Hallas; and A. Mellinger 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.