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Communications satellites.

Echo I (see 1961) could function as a passive communications satellite, since a radio beam could be aimed at it and the reflection would then reach Earth at a widely different spot. The reflection was too feeble to serve as anything more than a demonstration that it could be done, however.

On July 10, 1962, the United States launched Telstar I. It was a true communications satellite since it not only received radio waves but amplified them before sending them on. Thanks to Telstar I and to the numerous communications satellites that followed, it became possible to communicate easily, and in seconds, across continents and oceans. Communication capability is now truly global, and Earth is, in that respect, literally a global village.

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Author:Asimov, Isaac
Publication:Asimov's Chronology of Science & Discovery, Updated ed.
Article Type:Reference Source
Date:Jan 1, 1994
Words:122
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