Why weren and rsquot the ten smaller satellites discovered until a space probe?

The ten smaller satellites were not discovered until a space probe was sent because they are much fainter and smaller than the larger moons, making them difficult to detect from Earth. Earth-based observations are limited by atmospheric interference and the resolution of telescopes, which can miss smaller objects. Space probes, equipped with advanced imaging technology, can capture clearer and more detailed images, allowing for the discovery of these smaller satellites during close encounters.