Satellites use remote sensing, too.
A satellite gathers information about something that it is not in contact with and sends that information to people on the ground. Sometimes, a satellite uses a camera to get a picture, like we would use our eyes to see. The camera is called a sensor, since that is what the satellite uses to sense, or gather, the information. Satellites can use other types of sensors, and sense things that people can't. In the same way a doctor uses x-rays to see bones under the skin, the NASA satellite Magellan used radio waves to see through the dense clouds that shroud the surface of the planet Venus.