I would think a civilization advanced enough to build a Dyson sphere, would be advanced enough to hide it from our prying eyes if they wanted to.
I would think a civilization advanced enough to build a Dyson sphere, would be advanced enough to hide it from our prying eyes if they wanted to.
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They would also be very efficient and wouldn’t need such a contraption. Or maybe they figured out a way to harness dark energy.
The most likely explanation is they don’t exist.
If you build a physical barrier around your star to capture 100% of is energy, cloaking technology has to be in there somewhere.