Gravity-field data collected by Cassini instruments suggest Titan's interior is a chilly mix of ice studded with rock, though it seems the outermost shell of Titan (down to about 300 miles or 500 km) is devoid of any rock. The layers in the Titan artist's illustration show the moon's hazy surface (yellow), an ice layer starting near the surface (light gray), a possible internal ocean (blue), another layer of ice (light gray) and a mix fo rock and ice in the interior (dark gray).
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Jeanna served as editor-in-chief of Live Science. Previously, she was an assistant editor at Scholastic's Science World magazine. Jeanna has an English degree from Salisbury University, a master's degree in biogeochemistry and environmental sciences from the University of Maryland, and a graduate science journalism degree from New York University. She has worked as a biologist in Florida, where she monitored wetlands and did field surveys for endangered species. She also received an ocean sciences journalism fellowship from Woods Hole Oceanographic Institution.