পৃথিবীর প্রথম বাণিজ্যিক যোগযোগ কৃত্রিম উপগ্রহ কোনটি?
Solution
Correct Answer: Option D
Early Bird, also known as Intelsat I, the world's first commercial communications satellite, was built for the Communications Satellite Corporation (COMSAT) by the Space and Communications Group of Hughes Aircraft Company, later Hughes Space and Communications Company. The satellite was launched into synchronous orbit on 6 April 1965. It was placed in commercial service on June 28. Early Bird's design stemmed from the Syncom satellites Hughes had built for the National Aeronautics and Space Administration to demonstrate the feasibility of communications from synchronous orbit. On station in orbit 22,300 miles above the equator, Early Bird provided line of sight communications between Europe and North America. As a communications repeater, Early Bird handled communications that were representative of all types of common carrier network traffic, including telephone, television, telegraph, and facsimile transmissions.
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