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reserved for unpowered types, whether tethered (which means attached to the ground) or free-floating.

More recently, the US Government Accountability Office has used the term "aerostat" in a different sense, to distinguish the statically tethered balloon from the free-flying airship.

Types

Balloons

A balloon is an unpowered aerostat which has no means of propulsion and must be either tethered on a long cable or allowed to drift freely with the wind.

Although a free balloon travels at the speed of the

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