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Radar can scan the surface or the sky in all line-of-sight directions; and the maximum distance depends on the latest technology. The AN/SPS-30 air search radar used onboard aircraft carriers, such as the USS Oriskany during the Vietnam War, tracked aircraft at a distance of 300 miles.

According to a 1994 declassified Central Intelligence Agency report, radar was first used by the soviets to bounce a signal off the surface of the moon. The CIA report states: "A typical signal received via Moon Bounce is more than a million billion times weaker than if it were received in an airplane ten miles from the transmitter."

In 2006, NASA reported that they (using an antenna, three-quarters the size of a football field) "sent a 500-kilowatt strong, 90-minute long radar stream 231,800 miles to the Moon."

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12y ago

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