Its source is one and a half billion light years from Earth.
Astrophysics from the University of British Columbia published the results of a study of radio signals recorded outside the galaxy. Scientists have found among 13 signals one repeating with an unusual nature, coming from one source.
This is the second time that researchers have been able to capture a repeating signal, known as FRB (fast radio bursts, fast radio bursts). They usually come from a single point in space and are instant flashes lasting milliseconds.
Scientists believe that the second signal brought them closer to unraveling what could be the cause of the phenomenon. So far, researchers have only a few unconfirmed theories: for example, the source is considered a neutron star with a very powerful magnetic field that rotates quickly, or two merging neutron stars.
One of the most unpopular hypotheses is the presence of an alien spacecraft. Some also believe that a black hole or another supermassive object can be the source of the signal, since in one burst 25 million times more energy is concentrated than in the Sun.
The first FRB discovered in 2007, since then, scientists have recorded 52 sources of signals. The first repeating signal from one place was discovered in 2016 – then the source was six billion light years from Earth. Scientists are interested in FRB-signals, because they can explore the universe by them: passing through a substance, the signal is distorted each time.
Researchers believe that up to 5,000 FRB signals can go to Earth every day. However, they are extremely difficult to detect, because scientists never know when and where they come from. Until now, researchers have been lucky: telescopes accidentally induced in the right place and time.