So fast radio pulses could be anything, but since no natural source has been found, its probably aliens.
From Space.com:”
Bizarre flashes of cosmic light may actually be generated by advanced alien civilizations, as a way to accelerate interstellar spacecraft to tremendous speeds, a new study suggests.
Astronomers have catalogued just 20 or so of these brief, superbright flashes, which are known as fast radio bursts (FRBs), since the first one was detected in 2007. FRBs seem to be coming from galaxies billions of light-years away, but what’s causing them remains a mystery.
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More at Space.com http://www.space.com/35996-fast-radio-bursts-powering-alien-spacecraft.html
