I don't know if balloons are practical, but that's the general idea of the Pegasus rocket, although it never achieved the cost savings they were hoping for. ht

I don't know if balloons are practical, but that's the general idea of the Pegasus rocket, although it never achieved the cost savings they were hoping for. http://en.wikipedia.org/wiki/Pegasus_%28rocket%29 http://en.wikipedia.org/wiki/Pegasus_%28rocket%29