Moss on the Sun (IMAGE) NASA/Goddard Space Flight Center Caption At the center of this image (left) from NASA’s High Resolution Coronal Imager sounding rocket is a small-scale, patchy structure on the Sun that solar physicists call “moss.” It forms low in the solar atmosphere around the center of sunspot groups on the Sun where magnetic activity is strong. An image from NASA’s Interface Region Imaging Spectrograph, or IRIS, mission shows a detailed scenery of the cooler roots of moss (right). Credit NASA/Bose et al 2024 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.