On the Cover: On July 3, 2005, 67 seconds after its impactor smashed into the nucleus of comet Temple 1, Deep Impact’s flyby spacecraft took this picture. Scattered light from the collision saturated the high-resolution camera’s light detector on the flyby craft, creating the bright splash and rays seen here. It’s reflected sunlight, however, that illuminates the comet’s nucleus. NASA / JPL-Caltech / University of Maryland
8 Approaching Xanadu: Cassini-Huygens Examines Titan: Toby Owenexplains what Cassini-Huygens has taught us so far about Titan and its tantalizing atmosphere.
14 We Must Decide to Do It! The Saga of Asteroid 2004MN4: Rusty Schweickartdiscusses how we can deal with NEOs.
3 Members' Dialogue On Cosmos 1
4 We Make it Happen! The story of Cosmos 1 is not over.
19 World Watch The effects of ITAR on the future of the ISS and INA
15 Q&A How do central peaks in craters form?
22 Society News 25th anniversary events and specials, and a new look for the website
Let's Change the World
Become a member of The Planetary Society and together we will create the future of space exploration.