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I know people bounced lasers off of Venus and Mercury in 1960s in order to test the Shapiro delay. Since then, we've developed higher-power lasers and radio transmitters (Bolshakovo transmitter).

Does anyone know of any farther objects where we've been able to detect the reflected wave?

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In some extent, the Voyagers, it depends on your definition or curiosity purposes. –  Py-ser Jun 26 at 3:55
So far, we are able to communicate with Voyagers. However that is not what I wanted. I mean direct reflection of laser or radio signal, which is totally different with communicating with Voyagers. –  questionhang Jun 26 at 5:14
Very useful wiki link. At least we have got the signal bounced off by asteroids between Mars and Jupiter. However it seems we are able to do it further, because we still have good resolution at that distance. –  questionhang Jun 27 at 1:58

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