On the Cover: The United States has the opportunity to unify and inspire the world's spacefaring nations to create a future brightened by new goals, such as the human exploration of Mars and near-Earth asteroids. Inset: American astronaut Peggy A. Whitson and Russian cosmonaut Yuri I. Malenchenko try out training versions of Russian Orlan spacesuits. Background: The High Resolution Camera on Mars Express took this snapshot of Candor Chasma, Mars, a valley in the northern part of Valles Marineris, on July 6, 2006.
4 Bootleg Postcards: Amateurs Participating in Space Missions: Doug Ellison showcases the talents of amateur space image processors.
10 Beyond the Moon: A New Roadmap for Human Space Exploration in the 21st Century: The Roadmap Team discusses the purpose, value, and implementation of America's space program.
16 Looking Forward to a New Year of Exploration! Louis D. Friedman looks at The Planetary Society's year ahead.
18 We Make it Happen! Celebrating 5 years on Mars with the Mars Exploration Rovers.
20 Q&A Titan's lakes and Jupiter's storms
21 Factinos Planetary evolution; the motion of the Milky Way
22 Society News The International Year of Astronomy kicks off.