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Scientists detect an unexplainable radio signal from outer space that repeats every 16 days

For the first time, scientists have detected a radio signal from outer space that repeats at regular intervals.

The series of "fast radio bursts" – short-lived pulses of radio waves that  come from across the universe – were detected about once an hour for  four days and then stopped, only to start up again 12 days later. 

This cycle repeated every 16.35 days for more than a year, according to a new paper about the research.  

The bursts originated from a galaxy about 500 million light-years away.

"The discovery of a 16.35-day periodicity in a repeating FRB source is an  important clue to the nature of this object," the scientists said in the paper.

An artist's conception of how ground-based telescopes detected a "fast radio burst" from a distant galaxy.

The repeating pattern, reports Science X Network, "suggests the source could be a celestial body of some kind orbiting  around a star or another body. In such a scenario, the signals would  cease when they are obstructed by the other body."

"But that still does not explain how a celestial body could be sending out  such signals on a regular basis," Science X said. "Another possibility  is that stellar winds might be alternately boosting or blocking signals  from a body behind them. Or it could be that the source is a celestial  body that is rotating."

It's not likely to be aliens, the Massachusetts Institute of Technology said in a statement, because the signals are a sign of energetic events that are on the  extreme scale of the cosmos. "Even a highly intelligent species would be very unlikely to produce energies like this. And there is no detectable pattern so far that would suggest there’s a sentient hand at play," MIT said.

Fast radio bursts last only a few milliseconds, which makes it difficult to accurately determine where they have come from.

"One of the greatest mysteries in astronomy right now is the origin of  short, dramatic bursts of radio light seen across the universe," the Max Planck Institute for Radio Astronomy said in a statement. 

"Although they last for only a thousandth of a second, there are now hundreds of  records of these enigmatic sources," the institute said.

Since 2007, according to MIT, most of the radio bursts are “one-offs,” but a  small number are “repeaters” which recur in the same place.

The fast radio burst that repeats every 16 days was detected by the Canadian Hydrogen Intensity Mapping Experiment, a radio telescope designed and built by several groups of Canadian scientists to study space phenomena.