Jay Trimble of NASA Ames Research Center will share photographs and discuss what NASA has learned about Mars from its robotic explorers in a presentation titled "The Exploration of Mars." This free program is sponsored by the Walnut Creek Library Foundation in celebration of Walnut Creek’s 2016 One City One Book selection, “The Martian” by Andy Weir. Trimble will recount stories from NASA’s Mars Missions along what the fictional Mark Watney, protagonist of "The Martian," might see on Mars. Register online at www.wclibrary.org/one-city-one-book/