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Radar
 

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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
 



Sentences:
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.





Related Links:
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.
Image Credit: 
NASA
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Page Last Updated: July 17th, 2014
Page Editor: NASA Education