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Radar is a system that uses radio waves to determine and map the location, direction, and/or speed of both moving and fixed objects such as starcraft, weather formations and terrain. A transmitter emits radio waves, which are reflected by the target and detected by a receiver, typically in the same location as the transmitter. Although the radio signal returned is usually very weak, radio signals can easily be amplified, so radar can detect objects at ranges where other emissions, such as sound or visible light, would be too weak to detect. Radar is one of the two primary sensor-technologies used aboard spacecraft.