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The study was published in journal Astrophysical Journal Letters, and it's not the first time gravitational microlensing uncovered an interesting object.

Using data from NASA's Chandra X-ray observatory, the researchers detected oscillations in the light of the quasar that could only be explained by the presence of planets in this galaxy.

There are around 2,000 moon-to-Jupiter sized planets for each main sequence star in their observations, the researchers wrote, which equates to trillions of stars per galaxy.

Thanks to the relentless march of technology, we now have several thousands of exoplanets on the books, with more being discovered on a regular basis.

For the purposes of their study, the researchers relied on the gravitational microlens technique, which relies on the gravitational force of distant objects to focus light from a star.

"We show that quasar microlensing provides a means to probe extragalactic planets in the lens galaxy, by studying the microlensing properties of emission close to the event horizon of the supermassive black hole of the background quasar, using the current generation telescopes", the researchers write.

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The new discovery has given some significant information about our solar system by extending the limitation of previously formed data on the Universe. This, in turn, helps the Astrophysicists to determine the mass of the planet. Since 2014, the Kepler has continued to search for planets outside of Earth's solar system while coming across young stars, supernovae and "other cosmic phenomena".

"This is an example of how powerful the techniques of analysis of extragalactic microlensing can be".

'However, we are able to study them, unveil their presence and even have an idea of their masses. This is the first time that planets are being located in other galaxies. "This is very cool science", Guerras added.

More than 2,000 planets were detected, majority wandering through space not orbiting a star or orbiting between several stars, National Geographic reported. But so far all of those planets have been in our general celestial neighborhood, within our galaxy, the Milky Way. These newly-discovered extragalactic planets, however, are located some 3.8 billion years away.

In the university's announcement, Guerras said "there is not the slightest chance of observing these planets directly" because of the distances involved.

Up until now, while we've been pretty certain that planets must exist in foreign galaxies, we haven't actually be able to spot them-not because they're hiding, but simply because there's a limit to how far our sensors can reach.