"When you look up at the night sky, do you ever wonder why some stars seem to move? These moving lights are not stars. They are artificial satellites, machines put into space to help us communicate or gather information here on Earth. From the launch of the first artificial satellite in 1957 to the space telescopes making headlines today, these orbiting eyes have helped us study the heavens, survey the earth, stay in touch, and protect our homelands"--Publisher...