Quote: A mysterious radio signal which may have come from a black hole, a neutron star or even an alien civilisation, has been picked up by astronomers.
Fast radio bursts, which last only milliseconds, are quick, bright flashes of radio waves from unknown sources in the universe, which emit as much energy as the Sun does in an entire day.
The first one was discovered in 2007 by sifting through old data, and only seven more have been spotted since then.
Now, for the first time, the mysterious phenomenon has been observed happening live.
Exactly what may be causing the signal is hotly debated by scientists. Possibilities range from evaporating black holes to alien communication and merging neutron stars.