However, before getting too excited about the prospect of finding Ewoks, it should be noted that the exomoon (formally named as Kepler-1625b-i) has a radius of around four times that of the Earth and a mass of around 16 times that of our planet, so is in fact similar in size and mass to the planet Neptune.
The hunt for exoplanets - planets outside our own Solar System - provided its first results only 30 years ago.
NASA's upcoming James Webb Space Telescope is expected to "clean up" the satellite search, allowing astronomers to target larger planets that are farther from their star than Earth is from the Sun.
Now, David Kipping and Alex Teachey from Columbia University in NY are hoping that in their result and reports have taken every hypothesis in consideration and that they will get independent confirmation and appreciation. It is gaseous and orbits a gas planet 10 times the mass of Jupiter. Such large moons do not exist in our own solar system.
"If confirmed by follow-up Hubble observations, the finding could provide vital clues about the development of planetary systems and may cause experts to revisit theories of how moons form around planets". The moon of Jupiter Ganymede has a diameter of about 5 260 km is estimated, the detected aktolun has a diameter of about 49 000 km. The planet goes around the yellow parent star every 287 days at the same distance as the Earth orbits the sun. A mass ratio that is similar to that of Earth and the Moon. This occurs when the exoplanet passes in front of the star, and the method is therefore called the "transit method". Kipping and his colleague Alex Tichy made their discovery based on the more than 300 distant planets, which were discovered using the space telescope Kepler. Passing along with the planet on the background of its star, they make a very weak contribution to the change in its brightness, to the same place for more complex trajectories and give less clear signal. The so-called aktolun much more than the largest moon of the planets in our solar system. Other convincing evidence in favor of the obvious discovery was that the planet passed in front of its star an hour earlier than they predicted.
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There are other possible explanations, but "a companion moon is the simplest and most natural explanation for the second dip in the light curve and the orbit-timing deviation", Kipping said in a statement.
In an attempt to confirm their original tentative detection, the team behind the new study scheduled high precision measurements of Kepler-1625 with the Hubble Space Telescope, which were carried out in October 2017.
In the Hubble data, they saw a moon tugging along, "trailing the planet like a dog following its owner on a leash". Of the eight planets, only mercury and Venus they are not. But, according to Kipping, neither gaseous object is suitable for life as we know it. He stated "The biggest things will be the easiest to find", as he claims that it would be possible to spot the planet footprints in the starlight due to the large size. On the other hand, the scientists agreed that another planet in Kepler-1625b's vicinity might also cause such turbulence.
"But going forward, I think we're opening the doors to finding worlds like that", Teachey said.