Horowitz

Last year, NASA revealed its concepts for the rocketships that will carry people and cargo to the moon late in the next decade. This year's activities build on that, according to the agency official in charge of the moon exploration program, former astronaut Scott Horowitz.

NASA officials have been reorganizing the agency to meet the deadline while continuing to build the International Space Station and operate the space shuttle until 2010. It is like a two front war, and to make things harder, they must work without budget increases for the additional program. Scott Horowitz calls the effort a grand challenge.