aerostat
noun 2
Definitions
noun
1
An aircraft, such as a dirigible or balloon, that derives its lift from buoyancy rather than from wings or rotors.
With its molten temperatures, sulphuric acid clouds, and crushing carbon dioxide atmosphere, Venus has only a handful of aerostat research outposts.
2
A moored balloon flown in a semi-permanent manner, such as a border patrol monitoring balloon affixed at 18,000 feet (~6 km).
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