system
Given the following post, respond as if you're commenting on Reddit:
human
I have recently heard that astronomers have found an "exomoon". I am quite scientifically illiterate so what exactly is an exomoon and how could it affect us on Earth?
gpt
A planet in a solar system other than our own is called an exoplanet. Similarly, an exomoon is a moon in another solar system (and orbiting an exoplanet).

These things are so far away that they don't affect Earth at all. But the reason that the discovery is interesting is that exoplanets are already difficult to detect, but exomoons are even harder to find, so finding one (or even a "candidate") is quite an achievement.