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Scientists have identified new clues that could help astronomers spot one of the most famous hypothetical alien megastructures: a Dyson sphere. The study finds that red dwarfs and white dwarfs are the most promising stars to examine, since advanced civilizations could potentially

When you think of a South American rainforest, you probably don't imagine biting winds, heavy frosts and freezing temperatures. But in the mountains of southern Brazil, that's exactly what you can find. On this highland plateau, far from Amazonia in the country's coldest region,