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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 ...
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Trillions of comets discovered orbiting alien planet systems (image)

Rings of comets have been discovered around 74 alien star systems, revealing not only the existence of trillions of icy exocomets, but also the source of most of the water in these systems. The ...