The first burst of cosmic radio waves to be detected within our galaxy is repeating, according to scientists, shedding new light on one of the great mysteries of the universe. The ultra-bright flashes of energy, more powerful than those emitted by the Sun, come from a young star about 30,000 light-years from Earth. Multiple telescopes detected a cosmic signal coming from the star in April and in a new paper scientists reveal that it has repeated twice in the months since. Known as fast radio bursts (FRB), these high-intensity emissions usually last only for a fraction of a second. FRBs were first detected in 2007 but almost all that have been detected so far were too far away to clearly make out where they came from.