Now that we're back in space, where should we go next? President Bush has suggested that exploration of the solar system should be the main mission of NASA. Others suggest the focus should be more terrestrial. We talked to space experts and took your calls.
Scheduled guests: Ralph Harvey, planetary geologist; Iwan Alexander, professor of Mechanical and Aerospace Engineering, Case Western and head of the National Center for Space Exploration Research on Fluids and Combustion; Tony Strazisar, chief scientist, NASA-Glenn Research Center.