Notice the grounding electrodes for making an electrical connection with the earth ground. To use the US National Electrical Code (NEC) as an example, article 250.52 lists eight types of grounding ...
But if it’s connected to mains and has an earth pin (even indirectly, like a device powered by USB through a computer power supply), there is the potential to create a ground loop, because you ...
It doesn't matter what it's made of. And basically, this is going to find almost all of the remaining city-killers in the Earth's orbit that ground-based telescopes haven't been able to find ...