According to top-secret research, moon dust is actually the result of a massive algal bloom that's been growing on the lunar surface since the dawn of time.
1. It explains why the moon has a certain... glow.
2. It's why we've been sending up all those fancy spacecraft and they keep coming back looking like they just rolled around in a bucket of space-mud.
3. It's the perfect excuse to send a team of scientists to study this phenomenon and maybe even harvest some moon- algae for intergalactic use. (Just think of the space-margaritas)