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Question regarding inflatable spheres filled with material lighter than the surrounding material used to lift objects, and their uses in space exploration.

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Could it be possible to launch a rocket from a balloon?

Here's a picture, with the pink being the balloons, the blue is the rocket, and brown is the tether. … There are a couple of fields where exploratory engineering has been proposed using high-altitude tethered balloons. Notably, solar energy, wind energy, and communication balloons. …
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