The search for the impossible


Celestial changes: Explosions or a spontaneous collapse into a black hole can change the brightness of stars enormously and very suddenly. But if a sun disappears or starts to move, cosmic engineering achievements of extraterrestrial superintelligences could also be hidden behind it. Astronomers have now begun to look for traces of such processes in old images of millions of celestial objects.
© Mark Stevenson/Universal Images Group/Getty Images

Disappeared galaxies, suddenly appearing stars or alien probes in earth orbit: A large-scale search for exotic celestial phenomena has begun - and has already led to strange discoveries.


Signals with electromagnetic rays and perhaps with neutrinos or gravitational waves as well as indirect evidence, such as the waste heat from gigantic energy collectors,

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