How would an alien civilization realistically monitor earth?
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If a Kardashev Type III alien civilization wanted to monitor the earth (and its inhabitants' progress) via a satellite/orbiting object, how would they realistically transmit data from this object?
Some notes:
- The reason they want to monitor the earth is undefined, I'm focusing on the technology
- The civilization on earth would eventually need to notice this object, so I'd like it to be physical
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