NASA just "pinged" shortwave signals (9.6 MHz) off a passing asteroid. Turns out the much higher-frequency signals they usually send will bounce back but don't give any info about the innards of the object. The SW signals can. People who knew it was going to happen were able to listen in. Read about it here:
https://spaceweatherarchive.com/2022/12 ... -asteroid/
Chris Campbell
Calling the nearest asteroid....
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