The wonders continue in the Saturnian system, revealed by the Cassini spacecraft that is nearing its fifth anniversary in orbit. Deputy Project Scientist Linda Spilker provides another of her regular mission updates. Bill Nye wonders about the fuss over retirement of the Space Shuttle. Emily Lakdawalla walks the riverbeds of Mars. Bruce Betts and Mat Kaplan speak of the wonders of the night sky and at least one pedestrian topic in What's Up, featuring a new space trivia contest.