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As far as technological races go, humans are welterweights in comparison to hypothetical alien civilizations that could, conceivably, inhabit an entire galaxy. But if these vastly advanced extraterrestrials do exist, how could our current (and, frankly, meager) technology go about detecting them?

The answer could be in seeking out the galactic waste — heat waste to be precise — that such huge civilizations would generate. What’s more, we may already have the observational data to begin a detailed search of the Cosmos.

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