text:  NASA has awarded Elon Musk's SpaceX an $843 million contract to build a vehicle that will bring the International Space Station out of its longtime orbit of Earth when its operating lifespan ends. The ISS was launched in 1998, is getting worn out, and is expected to be put out of service by 2030. Crews have been on the ISS since 2000. Michael Toscano, CBS News.