NASA Images Showing Earth at Night (IMAGE) NASA/Goddard Space Flight Center Caption NASA images showing Earth at night (such as this composite) inspired Principal Investigator Stan Hooker to develop an instrument that could measure ocean color under low-light conditions. Credit NASA 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.