Mars has permanent polar caps composed of water ice, and seasonal polar caps composed of carbon dioxide ice (dry ice). In the spring, the seasonal cap ice turns into gas as the sun comes up and shines on the ice. This is a time of great activity as the escaping gas causes avalanches, sandfalls on dunes and carves spider-like channels in the surface. The latest images from the high resolution camera on the Mars Reconnaissance Orbiter are helping us to understand this unearthly phenomena. This talk is co-sponsored by the JPL ESD Planetary Science Visitor and Colloquium Program. Speaker: Dr. Candice Hansen Former Principal Scientist, Planetary Sciences Section, Planetary Ices Group, JPL Source: www.jpl.nasa.gov/events/lectures_archive.php?year=2010&month=12 Credits: NASA/JPL-Caltech The von Kármán Lecture Series General Information The Theodore von Kármán Lecture Series, named after JPL's founder, and presented by JPL's Office of Communication and Education, brings the excitement of the space program's missions, instruments and other technologies to both JPL employees and the local community. Lectures take place twice per month, on consecutive Thursdays and Fridays. The Thursday lectures take place in JPL's Theodore von Kármán Auditorium and are streamed live via Ustream, and Friday lectures take place at Pasadena City College's Vosloh Forum. Both start at 7:00 PM. Admission and parking are free for all lectures, no reservations are required, and seating is limited. Support the Channel vie BOOK DEPOSITARY Shopping Book Depository: Millions of books with free delivery worldwide www.bookdepository.com/?a_aid=Booklibrary FOLLOW THE CHANNEL ON TWITTER twitter.com/FREESPACELIVE Enjoy, Share, Like and Subscribe:)

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