M-dwarf system (IMAGE) University of California - Riverside Caption Artist rendering of an M-dwarf star, with three exoplanets orbiting. About 75 percent of all stars in the sky are the cooler, smaller red dwarfs. Credit NASA Usage Restrictions No restrictions. License Public Domain 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.