Echo, NASA’s First Communications SatelliteEcho, 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.Read More Facebook Pinterest X LinkedIn Email https://www.nasa.gov/image-detail/echo-nasas-first-communications-satellite/Copy URL to clipboard> DownloadShareSize1041x790px