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Kipping has spent a decade working on the "exomoon hunt".

"You could argue that because larger objects are easier to detect than smaller ones, this is really the lowest-hanging fruit, so it might not be wholly unexpected that the first exomoon detection would be among the largest possible", Teachey said. They believe it's orbiting a gas giant. Especially interested in the outer solar system, Laurel gave a brief presentation at the 2008 Great Planet Debate held at the Johns Hopkins University Applied Physics Lab in Laurel, MD.

So Kipping and Teachey poured over data from NASA's Kepler space telescope, an exoplanet hunting satellite.

And in one instance, they found "deviations and wobbles" in the light curve representing a planet known as Kepler-1625b.

"We saw little deviations and wobbles in the light curve that caught our attention", David Kipping, second author of the study, said. The scientists needed more time and data to confirm the discovery though, and they got it through the Hubble telescope. However, the researchers' alloted observation time ended before the planet could complete its transit.

During a transit period, in which the planet passed in front of its star, Hubble detected a second decrease in the star's brightness after the planet. On the other hand, the scientists agreed that another planet in Kepler-1625b's vicinity might also cause such turbulence.

Prithvi becomes youngest Indian to score 100 on Test debut
He is also the third batsman after Shikhar Dhawan (85 balls) and Dwayne Smith (93) to hit his debut ton in under 100 balls. I used to play 30-35 school games in a year, and played a lot of (first-class) Ranji (Trophy) cricket as well.

This artist's impression depicts the exomoon candidate Kepler-1625b-i, the planet it is orbiting and the star in the centre of the star system. This is interpreted as a so-called transit timing variation, caused by an unaccounted for gravitational tug on the planet by an unseen body.

Spotting an exomoon is done in largely the same way, and if the team's measurements are on point we're looking at an absolutely enormous moon and an even larger host planet. "But we knew our job was to keep a level head testing every conceivable way in which the data could be tricking us until we were left with no other explanation". The planet itself is several times heavier than Jupiter, and its mass, the moon is 1.5% of the mass of the planet.

Kepler-1625B and its moon appear to have a similar ratio to Earth and the Moon but both are much larger. Researchers from the US-based Columbia University said that such a huge moon is not in our own solar system, but such 200 natural satellites have been listed. Out of the eight planets, only Mercury and Venus have none. They also shift position with each orbit.

Scientists are convinced that have received the exact proof of the existence of the moon orbiting the exoplanet Kepler-1625b. The Earth-moon system formed as a result of a giant impact in the early solar system.

The host planet and its moon lie within the habitable zone of the star Kepler 1625 where moderate temperatures allow for the existence of liquid water on solid surfaces. "Both bodies, however, are considered to be gaseous and therefore unsuitable for life as we know it", Kipping added. There are just a handful of these in the Kepler database. Once the James Webb Space Telescope launches in 2021, the search for exomoons may be full of possibilities. "We didn't think we had enough to claim a discovery", says Kipping.