What is the difference between the trajectories of molecules in the vicinity of the Moon and in the Earth’s atmosphere?

In the dense earth’s atmosphere, the average path length of molecules is very small and the trajectories of molecules are straight lines. In an extremely rarefied lunar atmosphere, the average path of molecules is 10 to 100 times the radius of the moon. Atoms and molecules move in elliptical orbits, with the Moon at one of the focuses.