Researchers recently discovered that the Neptunian moons Naiad and Thalassa avoid collision thanks to Naiad’s tilted orbit that moves up and down like a never ending wave. This orbital relationship is called orbital resonance, something that can be seen in the case of Pluto and Neptune. Pluto orbits the sun twice for every three times Neptune does. What makes this particular orbital resonance unique is that it involves two small moons close together. Researchers haven’t observed two moons close together have this type of relationship with each other. At least not in our solar system. Pretty wild.