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Giant 'metal cloud' spotted in nearby star system could be hiding a second alien sun

Astronomers suspect that a massive metallic cloud swirling in a nearby star system could be hiding a giant planet or dwarf ...
Modern Engineering Marvels on MSN

Technosignature hints are hardening into testable targets for modern telescopes

This is not an individual solid shell around the star, as an astronomer named Jason Wright explained the appearance of a plausible energy-harvesting system would appear at a great distance: not a ...