Caltech researchers have identified geological features on Mars that could point to the existence of a long-dried ocean that once covered a third of the Red Planet's surface. The research was conducted by former Caltech postdoctoral scholar Abdallah Zaki and Caltech professor of geology Michael Lamb . The study is described in a paper appearing in the journal Nature on April 15. As a key ingredient for life, water on other bodies in the solar system is a major area of study. While it is widely