Scientists who found an 'impossible' spinning object in space that sent repeating radio signals to Earth every 18 minutes were initially 'concerned' they might have picked up a message from a distant civilisation.Observations show it releasing a giant burst of energy three times an hour - and when she discovered it, astrophysicist Dr Natasha Hurley-Walker 'broke out in a cold sweat', thinking there might have been a breakthrough in the search for extra-terrestrial intelligent life.
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