Which was the world’s first communication satellite? (Echo-1)

In 1960, the USA’s space agency NASA launched a balloon-shaped satellite, Echo-1 (photo, below). It took up an orbit comparatively close to Earth, about 1600 kilometers up. Once in position, it grew to a diameter of 30 meters (100 feet), by inflating its own balloon made of a plastic material called Mylar. The Mylar had a reflective coating of aluminum. Radio signals beamed from Earth to  Echo-1 bounced off the Satellite’s surface and could be received on the  Earth far from the original transmission.
NASA’s Echo-1 successfully transmitted voice, music and pictures between the USA and Europe, but in 1968 it disappeared from the sky.

Additional reading:
Project Echo (Wikipedia)

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