Labels: text | sphere | planet | screenshot OCR: S: GENERAL INFORMATION MARS'S SATELLITES The martian Valles Marineris subsoil Region 60' Longitude Atmospheric pressure readings Tharsis Region 160' Longitude Syrtis Major Region 270' Longitude Mars's south pole bruary 1995 HST . WFPC2 20 . March 21, 1995 . P. James (U.Toledo) NASA