The Prospero satellite, also known as the X-3, was launched by the United Kingdom in 1971. It was designed to undertake a series of experiments to study the effects of the space environment on communications satellites and remained operational until 1973, after which it was contacted annually for over 25 years.
The Prospero satellite, also known as the X-3, was launched by the United Kingdom in 1971. It was designed to undertake a series of experiments to study the effects of the space environment on communications satellites and remained operational until 1973, after which it was contacted annually for over 25 years.
Source: Wikipedia "Prospero (spacecraft)" · CC BY-SA 4.0
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