That is the theory, at least. So far, apart from some low-altitude test flights, the only stratospheric tests have involved a scaled-down version tethered to a weather balloon.

So far, apart from some low-altitude test flights, the only stratospheric tests have involved a scaled-down version tethered to a weather balloon.

Stratospheric: Robert Harrison captured images of the Earth like this one using a Canon Sure Shot camera fixed in a polystyrene box and attached to a helium balloon