For the second time, scientists have detected repeating energy bursts.

Fast radio bursts (FRB) are radio emissions that appear randomly and for a very short time, meaning they are incredibly difficult to detect and to study. According to scientists, the latest detected reached Earth from a galaxy that is presumably 1.5 billion light years away.

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The flashes only lasted 0.001 seconds, but the energy they were sent out with is equal to what the sun produces in a year.

This has led to much debate amongst experts as to whether the source of the signals were black holes or super-dense neutron stars. However, others have had more bizarre theories, such as they could have come from an ancient and advanced alien civilization. Right now, though, we have no evidence to believe FRBs are anything but astrophysical sources, such as a young magnetar with an extremely powerful magnetic field.

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The first FRB was detected in 2007 by accident when scientists were analyzing archival radio astronomy data collected in 2001. However, it was so random and short that astronomers took years to agree that it wasn’t a malfunction of the telescope’s instruments.

The new discovery, which was reported in the Nature journal, was made by an astronomer team from Canada who were hunting for FRBs.

During the summer of last year, over the span of 3 weeks, they detected 13 flashes and found that one was repeating.

To date, over 60 FRBs have been detected, but there was only one case of repeating bursts such as this, which was picked up by the Arecibo Observatory in Puerto Rico, United States in 2015.

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It is unknown where the FRBs came from but they are believed to originate from billions of light years away from the Milky Way, the galaxy we are currently in.

Astrophysicist Dr. Ingrid Stairs of the University of British Columbia, Canada says this discovery implies that there are more repeaters out there, and now that scientists have one more instance to study from, we might one day be able to comprehend these mysteries of the universes: where the signals came from, and what caused them.