It s a beautiful evening. The sun has set and the stars are starting to twinkle. You are laying in the grass enjoying the atmosphere and the wide open sky. Considering that there are hundreds of satellites in orbit from a few hundred miles to 22,300 miles above the Earth, the light is most likely a communication satellite.
Communication satellites are microwave relay stations in the sky.
They take signals that are transmitted to them from a ground antenna and retransmit them to other ground stations within their range. Actually, they do quite a bit for the normal human being. Throughout the late sixties and seventies satellite technology greatly improved due to the increased use of computers for satellite design. Before 1972, domestic satellite communication was limited to the military and the government. Satellites are put into orbit byr rocket powered launch pads or boosters.