What are those scary metallic sounds from space? Do aliens send signals to us? Scientists may finally have been discovered the source of the strange sound from space.

We’ve learned a lot about the universe, but there’s still so much we don’t know. One mystery in particular has been tormenting the minds of scientists for years. In 2007, researchers caught some weird radio signals coming from a place billions of light-years away.These signals weren’t the first radio signals scientists ever heard coming from deep space. They’re something known as fast radio bursts (FRBs) and can be described as short pulses of radio flashes arriving from the galactic outskirts of the universe. These bursts, whose exact sources are completely unknown to us, last a tiny fraction of a second and usually appear alone.

Researchers at the Harvard-Smithsonian Center for Astrophysics suppose that the source of these FRBs could be a gigantic transmitter twice the size of Earth powered by sunlight.

The second theory states that strong extragalactic beeps seem to be arriving from a massive black hole or an unprecedentedly powerful neutron star located more than 3 billion light-years from our planet in a potent interstellar nebula.

Jason Hessels, associate professor of the University of Amsterdam, and his team of researchers believe that the source of the bursts could be a rotating neutron star whose home is a place with a harsh magnetic environment, for example, a black hole that’s sucking in dust and gas and, therefore, still growing.

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