This radiation can be detected although Dyson spheres remain difficult to distinguish from natural astronomical objects that give off similar signatures.

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Two astronauts took eight hours to resurrect a spectrograph which is used to study the chemistry of astronomical objects and failed five years ago.

BBC: Brute force helps Hubble renewal

The image was discovered by the Wide-Field Infared Survey Explorer (WISE), which scans the night sky for lights in the infrared range to discover more about different aspects of astronomical objects.

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