Isaac Arthur on MSNOpinion
We might discover alien ruins before we meet aliens
If alien civilizations rise and fall, they may leave behind artifacts long after they are gone. From abandoned megastructures ...
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Ancient Egypt mystery reignited after death of researcher who claimed pyramids were not human-made
The mystery of how the Ancient Egyptian pyramids has been reignited by the death of a Swiss author, who famously argued that early human civilisations received help from extra-terrestrial visitors.
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