Boffins claim aliens may find it hard to visit Earth because the universe is always moving.
Scientists say there could be hidden obstacles for extraterrestrials venturing out in the cosmos as the vast universe is constantly on the move.
Astronomers are now fearing that as stars and planets are moving around one another in a 'cosmic waltz' could be a major hurdle for potential life from outside the galax.y
Hector Socas-Navarro, an astrophysicist at the Institute of Astrophysics of the Canary Islands, said: "If you try to tell somebody where you are, you need to have some common references, right? Ideally fixed references.
"But nothing is fixed in the galaxy."
However, the intelligent minds debating the problem are coming up with a solution.
Martin Reeves, the UK's royal astronomer also told LiveScience: "Most people would say, 'Send a strong radio wave transmission.'"
Electromagnetic radiation has been a common choice for broadcasting information into space, where anything from visible light to radio waves can be blasted out from Earth.
Subtly modulating the frequency of an electromagnetic wave could allow boffins to send complex messages in binary code.
And as the waves are directional, aliens could intercept the signal and trace it back to Earth.
It's not the first time scientists have used radio waves to attempt communication with intelligent life.
In 1974, researchers beamed a radio frequency message from the Arecibo telescope based in Puerto Rico.
They pushed out the message 21,000-light-years away towards the M13 star cluster, consisting of a simple pictograph in binary representing a DNA molecule, our solar system, and a stick human figure, according to the Search for Extraterrestrial Intelligence (SETI).
NASA has also blasted messages into space, where they sent the 'Across the Universe' signal back in 2008 which was made up of the Beatles hit.
One potential spanner in the works could be that as radio waves travel, they diffract or broaden, similarly to a ripple on the surface of water.
The danger is that if the message changes too much by the time it reaches another galaxy, the message could also be altered.
However, Svetlana Berdyugina, n astrophysicist with the Leibniz Institute for Solar Physics in Germany, says we should, instead, broadcast using visible laser light.
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