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A comment on A large asteroid recently flew close to Earth. Parent comment
https://en.wikipedia.org/wiki/Sentinel_Space_Telescope
Which was sadly cancelled: http://www.dailymail.co.uk/sciencetech/article-3255059/Nasa-...
But the principle was based off infrared: http://aviationweek.com/space/ball-aerospace-ramps-sentinel-...
The canadian satellite also uses light: https://en.wikipedia.org/wiki/Near_Earth_Object_Surveillance...
Visible light is only one fraction of the spectrum, infrared is far more valuable for detection. Most asteroids are detected via passive observation. Radio waves are not conducive to detecting asteroids.
https://en.wikipedia.org/wiki/Sentinel_Space_Telescope
Which was sadly cancelled: http://www.dailymail.co.uk/sciencetech/article-3255059/Nasa-...
But the principle was based off infrared: http://aviationweek.com/space/ball-aerospace-ramps-sentinel-...
The canadian satellite also uses light: https://en.wikipedia.org/wiki/Near_Earth_Object_Surveillance...
Visible light is only one fraction of the spectrum, infrared is far more valuable for detection. Most asteroids are detected via passive observation. Radio waves are not conducive to detecting asteroids.