We know that Moons are occurred throughout our solar system. The Earth only has one moon, while other planets including Mars, Jupiter, and Saturn, etc have numerous moons. But given the idea that planets can capture and ultimately possess moons, is it possible for natural satellites in and of themselves to do the same?
The idea of moons sporting their own moons isn’t new. But astronomers have yet to observe such an occurrence anywhere in our solar system. Although, it’s possible for a moon to have its own moon theoretically. But the circumstances would be particularly challenging to produce, which might explain why such an occurrence has proven to be so elusive.
For having a moon, several factors determine a world’s eligibility. The most imperative is the world’s hill sphere, but also important is how such a moon would orbit that world.
The hill sphere is essentially an invisible threshold. It dictates how far away a moon can be before it becomes influenced more by the Sun’s gravitational pull than by the gravity of the world it orbits.
Since, the moon resides inside of the Earth’s hill sphere, so it continues to orbit the Earth instead of being pulled toward the sun.
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