Two Chinese women walk past a billboard featuring a picture of the NASA space shuttle, on a Beijing street in 2001. NASA Administrator Michael Griffin visited China in 2006 to explore and expand space-program cooperation. Griffin made the trip at the invitation of Sun Laiyan, administrator of the China National Space Administration, after discussions between Chinese President Hu Jintao and U.S. President Bush during the U.S.-China summit in April 2006. (© AP Images)