Earth Lights (IMAGE) Southern Methodist University Caption This is an image of Earth's city lights created with data from the US Defense Meteorological Satellite Program Operational Linescan System, which is used to map the locations of permanent lights on the Earth's surface. More: <a href="http://visibleearth.nasa.gov/view.php?id=55167" target="_blank">http://visibleearth.nasa.gov/view.php?id=55167</a>. Credit NASA, NOAA Usage Restrictions Please credit 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.