Two Giant Belts of Radiation Surround Earth (image) NASA/Goddard Space Flight Center Share Print E-Mail Caption Two giant belts of radiation surround Earth. The inner belt is dominated by electrons and the outer one by protons. Credit NASA Usage Restrictions None Share Print E-Mail 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.