A Slice of Pluto (IMAGE) University of Arizona Caption The geologic structure beneath the surface of Sputnik Planitia, which is believed to be an ancient impact basin that has since filled in with volatile ices. On Pluto, it is possible that the thinned crust is overlying a liquid water ocean. Credit Illustration by James Keane Usage Restrictions This visual may only be used in conjunction of reporting/posting of this news release. Credit must be stated as indicated. 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.