High Altitude Balloon Launches
NASA’s high altitude balloon program.
The Canadian Space Agency run a similar program.
Climbing Out Into Space
Once the capsule had been lifted up to the edge of space by the balloon, it would fall free from under the balloon and then climb out into space driven by a small rocket, in a very similar way to the Virgin Galactic Spaceship. Instead of using a balloon to get the space craft up to the edge of space, Virgin Galctic use a special aircraft to carry it up there, but once it falls free, the concept is the same.