Scientists have found almost 5,000 planets outside our solar system.
But no one has found a moon in another solar system.
Moons orbit planets. The eight planets in our solar system have over 200 moons.
Earth has one moon, while Jupiter has 79 pieces.
There are probably many other planets out there that have moons, but scientists have not seen them yet.
In a new research article, scientists say that they may have found a huge moon orbiting an alien planet.
Different from the moons here at home
Moons can be gray and rocky like our moon, but they can also be different and more exciting.
Titan is a moon orbiting Saturn. Scientists believe there are mountains of ice and lakes of methane and ethane there. The moon Europa, which orbits Jupiter, is covered by ice. Under the ice it can be a large sea.
The new moon so
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