Something went wrong, please try again later. Invalid email Something went wrong, please try again later. For out-of-this-world news, sign up for the Spaced Out newsletterA scientist became "concerned" when she thought signals being sent to earth from space were being sent by "aliens". Dr Natasha Hurley-Walker was leading a team of researchers in Australia who found an 'impossible' spinning object in space that sent radio signals to Earth every 18 minutes"I was concerned that it was aliens," said Dr Hurley-Walker of the object 4,000 lightyears away from earth, as reported by News Science and Nature. There is a worldwide research effort searching for repeating cosmic radio signals transmitted at a single frequency.