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      a device that sends out radio waves and picks them up again after the waves strike another object and bounce back

Radar is used to help predict weather and measure waves of the ocean.

Police officers can tell how fast a car is going by using a radar device.

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Birds and Radar


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An illustration of a space shuttle, with its payload doors open, sending and receiving radar signals
Imaging radar works by bouncing a radio signal off the ground.
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Page Last Updated: July 17th, 2014
Page Editor: NASA Education