Orbits of Neptune's moons locked in a 'dance of avoidance': NASA

NASA revealed that Neptune's two innermost moons Naiad and Thalassa orbit only about 1,850 kilometres apart but they never get that close to each other. "Naiad's orbit is tilted and perfectly timed. Every time it passes the slower-moving Thalassa, the two are about 3,540 kilometres apart," NASA said. "Orbital dynamics experts are calling it a 'dance of avoidance'," NASA added.