There's also the matter of 1,500 light years, which means that if they're a thousand years ahead of us we won't out know about it for 500 more years. Think about it, we have less than 200 years since we first began broadcasting, they won't hear us for another 1,400 years or so. But if they're building structures that can block 20% of a stars output, they have to be using "free energy". we have just started with quantum mechanics so I'll guess that in another 1,500 years, if we survive, we'll probably doing that too.
A collection of articles defining our times. The pages contain clickable links, don't let the titles fool you, some of the best articles have very non-descript titles and there are usually more articles on the matters in the days and week pages the links land on so it's a sort of treasure hunt through history, Enjoy!
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