Phobos (the largest moon of Mars) is slowly getting closer to the planet. In about 50 million years, it will be torn apart by Mars’ tidal forces, leaving behind a ring system made up of rocks and dust.
Mars will become the main planet with rings in the solar system, effectively replacing Saturn, that will instead lose them.
Cosmic rays and radiation coming from the sun are constantly vaporizing the ice particles that make up the rings, thus forming charged water molecules that interact with Saturn’s magnetic field and end up falling on the planet. About 10 tons of disintegrated remains of the rings fall on Saturn every second.
An actual rain that over 100 million years will end up completely consuming its iconic rings.