Professor Gerhard Neukum is Principal Investigator for the High Resolution Stereo Camera aboard the European Space Agency's Mars Express orbiter. That camera has uncovered strong evidence of a frozen body of water the size of the North Sea. You'll hear about this and other discoveries. Emily Lakdawalla answers a question about the Earth's magnetic field. Bruce Betts gives away the first of our new Solar Sail posters on What's Up! All this, and space headlines.