Researchers believe it is possible to detect messages from aliens flying between planets, reports Popular Mechanics.

For more than half a century, scientists have been trying to detect messages from potential alien civilizations that inhabit our galaxy. So far, no signals have been detected that would indicate the existence of extraterrestrial intelligent life, but the search continues.

Researchers are mainly focused on finding alien messages that are directed at Earth or those that fly by. But aliens can exchange messages between planets outside the solar system.

The authors of the study, published in The Astronomical Journal, believe that this communication can be re-listened.

Astronomers have come up with a way that tests show could detect alien radio communications. From Earth, one exoplanet, that is, a planet outside the solar system, can be observed passing in front of another and blocking it. This is called an eclipse.

But the eclipsing planet does not always completely block the planet behind it. So any message that hypothetical aliens transmit from the eclipsed planet can be transmitted into space, and ground-based radio telescopes can detect it.