NASA's latest five-segment solid rocket development motor (DM-2) (Source: NASA) DM-2 awaits its first test fire Rocket will see first action in 2015 delivering new rescue capsule (Orion) to the ISS The U.S. space program is about to go through some dramatic changes. President Barack Obama has moved ahead with plans to retire the Space Shuttle in 2011. U.S. missions to the International Space Station will be provided by Russia's aging Soyuz modular spacecraft. Meanwhile, the U.S. government will work to fill its manned spacecraft needs with more permanent replacements from private sector companies like SpaceX and will fill in the...