We have changed the definition of "planet" multiple times so I'm sure we will redefine "moon" as well. Pluto was recently demoted but this has happened before

We have changed the definition of "planet" multiple times so I'm sure we will redefine "moon" as well. Pluto was recently demoted but this has happened before to Ceres and others. https://en.wikipedia.org/wiki/IAU_definition_of_planet https://en.wikipedia.org/wiki/IAU_definition_of_planet By 1851, the number of "planets" had grown to 23 (the eight recognised today, plus fifteen between Mars and Jupiter), and it was clear that hundreds more would eventually be discovered. Astronomers began cataloguing them separately and began calling them "asteroids" instead of "planets"