TSIS (IMAGE) NASA/Goddard Space Flight Center Caption Banner Image: For nearly 40 years, NASA has been measuring how much sunshine powers our home planet. This December, NASA is launching an instrument to the International Space Station to continue monitoring the Sun's energy input to the Earth system. Credit: NASA/Rani Gran Credit Rani Gran 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.