![The First Communications Satellite](https://www.nasa.gov/wp-content/uploads/2023/03/147787main_image_feature_559_ys_full.jpg)
Echo, NASA’s First Communications Satellite
Echo, NASA's first communications satellite, was a passive spacecraft based on a balloon design created by an engineer at the Langley Research Center. Made of Mylar, the satellite measured 100 feet (30 meters) in diameter.
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https://www.nasa.gov/image-detail/echo-nasas-first-communications-satellite/
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