Why alien 'megastructures' may hold the key to making contact with extraterrestrials. - NBCNewsMACH
or other odd phenomena here on Earth. We’re talking about massive engineering works that an advanced society has constructed somewhere in space.
Of course, you can believe the aliens have some good reason to spend lots of time transmitting to Earth, but if they’re even a short distance away , they won’t know we’re here — there hasn’t been enough time for our radar and television signals to reach them yet, even at theIn contrast, artifacts may be lurking in space just waiting our discovery, all night, every night. China’s Great Wall and the Egyptian pyramids are earthly constructions that have existed for centuries.
That explanation for Tabby’s star seems less likely today. Astronomical measurements show that it gets redder when it dims, suggesting that it’s surrounded by naturally produced dust, not a gargantuan group of light collectors. Recently, University of Chicago physicist Daniel Hooper offered a new idea for searching for high-tech alien artifacts. He notes that the universe is expanding, and galaxies are growing ever farther apart. So forward-thinkingwhile they can and park them in their cosmic neighborhoods as a hedge against future energy scarcity. This is akin to storing gasoline if you’re worried about a developing shortage.
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