Astronomers May Use Radar to Detect Cataclysmic Asteroids

Radar can reveal the surface and ancient geology of planets and their moons, letting us trace their evolution.  

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While most radio astronomy passively observes the radio light emitted from celestial objects, radar astronomy bounces radio light off objects in our solar system. 

Asteroids can be detected in both visible and infrared images, because they move across the sky with respect to stars.