UCF, Philip Metzger. (IMAGE) University of Central Florida Caption UCF Scientists Philip Metzger is a co-author on the paper questioning the logic behind Pluto's classification. Other authors include Mark Sykes, of the Planetary Science Institute; Alan Stern, of the Southwest Research Institute; and Runyon of Johns Hopkins University Applied Physics Laboratory. Credit University of Central Florida 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.