According to Wikipedia, the terms "moon" and "satellite" are basically interchangeable. There's some use of the term "moonlet" for very small bodies but there i

According to Wikipedia, the terms "moon" and "satellite" are basically interchangeable. There's some use of the term "moonlet" for very small bodies but there isn't a defined size you have to reach to be officially a moon (unlike a planet to the disappointment of Pluto fans). So drop your pen in a dusty part of Saturn's rings for example and it might be the biggest "moon" around and start attracting smaller bodies to itself.