エコー (人工衛星)
1. Project EchoProject Echo was the first passive communications satellite experiment. Each of the two American spacecraft, launched in 1960 and 1964, was a metalized balloon satellite acting as a passive reflector of microwave signals. Communication signals were bounced off of them from one point on Earth to another.
Read “Project Echo” on English Wikipedia
Read “エコー (人工衛星)” on Japanese Wikipedia
Read “Project Echo” on DBpedia
Read “Project Echo” on English Wikipedia
Read “エコー (人工衛星)” on Japanese Wikipedia
Read “Project Echo” on DBpedia
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