With the 100 Hours of Astronomy quickly approaching, we find out what will be happening over the course of the four days [01:08-07:06] and get details about a 24 hour observatory webcast [07:38-13:21]. We chat about the launch of NASA's Kepler spacecraft to search for Earth-like planets and ESA's GOCE probe to map the Earth's gravity field. On a recent trip to the Netherlands Roy caught up with Gijs Nelemans to find out about the future LISA spacecraft to hunt for gravitational waves [30:50-53:45]. We also put your astronomical questions to Dr Tim O'Brien [13:32-26:34] and round-up the feedback we've received since the last show.