Article from the website express.co.uk.
A team of American scientists have detected the first traces of advanced extraterrestrial colonies.
The astronomers detected unusually high levels of radiation in 50 different galaxies using NASA's orbiting infrared telescope, the Wide-field Infrared Survey Explorer (WISE).
Technologies from highly-developed extraterrestrial civilisations could be the source of these uncommonly high levels of radioactivity, the team has speculated.
Radiation could be emitted by these alien civilisations in the same way Earth radiates heat and light.
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