NITROGEN 2 (IMAGE) Rice University Caption Rice University graduate student and lead author Damanveer Grewal, seated, with faculty member Rajdeep Dasgupta, conducted the study on nitrogen isotope compositions of iron meteorites to show volatile elements deposited on Earth and other rocky planets in the early solar system had more than one source. Credit Jeff Fitlow/Rice University 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.