A balloon satellite, sometimes referred to as a "satelloon", is a satellite inflated with gas after it has been put into orbit. == Echo 1 and Echo 2 balloon satellites == The first flying body of this type was Echo 1, which was launched into a 1,600-kilometer (990 mi) high orbit on August 12, 1960, by the United States.
A balloon satellite, sometimes referred to as a "satelloon", is a satellite inflated with gas after it has been put into orbit. == Echo 1 and Echo 2 balloon satellites == The first flying body of this type was Echo 1, which was launched into a 1,600-kilometer (990 mi) high orbit on August 12, 1960, by the United States.
Source: Wikipedia "Balloon satellite" · CC BY-SA 4.0
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