There's no analog for such a large moon in our own system. In our sky, it would appear two times bigger than Earth's moon.
In October 2018, astronomers discovered what they thought could be an exomoon, a moon outside our solar system. The exomoon, which is estimated to be the size of Neptune, was found in orbit around a gigantic gas planet 8,000 light years from Earth.
It was the first time an exomoon candidate had been identified. Now, researchers have studied the size and orbit of the exomoon candidate, called Kepler-1625b-i, to determine how it might have formed. There are three primary theories about how moons form. One is when planets impact larger bodies and the blasted-off material becomes a moon.
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