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A strange signal emitted by an 'invisible object' far out in the Milky Way has baffled space boffins.
The bizarre radio waves sent by the untraced floating structure fits no understood pattern – and could be a new type of star altogether.
Scientists said the "extraordinary" find could be related to a different mysterious celestial object known as the ' cosmic burper '.
Study lead author Ziteng Wang said: "The strangest property of this new signal is that it is has a very high polarisation.
"This means its light oscillates in only one direction, but that direction rotates with time.
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"The brightness of the object also varies dramatically, by a factor of 100, and the signal switches on and off apparently at random.
"We've never seen anything like it."
The University of Sydney physics professor said the appearances given off so far look nothing like what's been spotted before.
He explained: "At first we thought it could be a pulsar – a very dense type of spinning dead star – or else a type of star that emits huge solar flares.
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"But the signals from this new source don't match what we expect from these types of celestial objects."
Mr Wang and a team of international space pros from Australia, the United States, Canada, South Africa, Germany Spain and France detected the strange signal from a massive telescope in western Australia.
Space and the existence of aliens has become stranger and more likely with every passing week, with spottings multiplying in recent months.
Just yesterday a UFO was 'spotted' projecting an orb directly onto Earth and was spotted by a space-watcher in Azpeitia, Spain.
And six would-be astronauts have journeyed to an Israeli desert in order to understand what it's like to live on Mars.
Scientists hope the mission will help them understand how humans survive in the toughest conditions in the universe.
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