What's next for NASA's space program? A former astronaut looks at the possibilities

The Atlantis mission will close the books on NASA's space shuttle program. Where does space exploration go from here?

This morning, CNN's Ali Velshi takes an in-depth look at the future of space travel with Jim Halsell, a former astronaut who has flown five shuttle missions - two as a commander, three as a pilot. He's now a vice president with ATK Aerospace Systems, working on a commercial vehicle to take NASA's astronauts back to space.

In this video, he explains where he thinks space travel will go in the future.