Earth, Wolf 503b and Neptune (IMAGE) University of Montreal Caption This is a size comparison of the Earth, Wolf 503b and Neptune. The color blue for Wolf 503b is imaginary; nothing is yet known about the atmosphere or surface of the planet. Credit NASA Goddard/Robert Simmon (Earth), NASA / JPL (Neptune). Usage Restrictions The image should be used to illustrate a story about Wolf 503b and the credit mentioned. 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.