"There is not the slightest chance of observing these planets directly, not even with the best telescope one can imagine in a science fiction scenario", Guerras admitted.
Normally, researchers spot exoplanets through the way they dim the stars they orbit when they pass between the star and our telescopes. B the use of this technique, the scientists can discover those planets which are at a really great distance from the Earth, and detect extragalactic galaxies.
Xinyu Dai, an astrophysicist and professor at the University of Oklahoma in the United States, made the discovery using data from the National Aeronautics and Space Administration's Chandra X-ray Observatory in space. A light-year is about 6 trillion miles.
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As it turns out, the galaxy that contains the planet is 3 years apart. We analyzed the high frequency of the signature by modelling the data to determine the mass'. According to them, they managed to find a group of planets in another galaxy, by using the microlensing mechanism.
"We are very excited about this discovery", said Dai.
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. A more powerful technique was required to find planets located at a more distant region from our galaxy.
Scientists were able to observe the magnified signatures of extragalactic exoplanets. Directly viewing exoplanets within the Milky Way is almost impossible, so astrophysicists have to sift through data and use other detection techniques that give way to evidence of planet signatures.
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The researchers at the University of Oklahoma in the U.S. found this signal at the Chandra X-Ray Observatory. The microlensing models were calculated at the OU Supercomputing Center for Education and Research.
Microlensing works like magnification, says co-author Eduardo Guerras.
'However, we are able to study them, unveil their presence and even have an idea of their masses.
The astronomer added that while humans can't actually see planets in another galaxy, revealing their existence was "very cool science".
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These new exoplanets, which no-one in our or future generations will likely ever see, range in size from as small as our moon to as large as gas giant Jupiter.