Astronomers exploring unconventional methods for detecting alien life have a new proposal: look for the cosmic debris of ancient megastructures. According to new research, the moon could harbor pulverized remnants of Dyson spheres—hypothetical megastructures that advanced civilizations might build to harvest energy from stars. Unlike transient signals, these physical signatures could have survived for millions of years, making the moon an ideal place to hunt for evidence of long-dead extraterrestrial engineering.

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