On the NASA multimedia gallery you can see ideas of what might be future developments of this agency.
An interesting initiative seeks to develop a spacecraft capable of recovering asteroids and lunar orbits take them to where it is possible to study the effect displaced astronauts.
The video, belonging to NASA, graphically describes one of the possible solutions to this challenge space.
NASA’s FY2014 budget proposal includes a plan to robotically capture a small near-Earth asteroid and redirect it safely to a stable lunar orbit where astronauts can visit and explore it. The proposed mission would combine the efforts of three NASA mission directorates: Human Exploration and Operations, Science and Space Technology.