NASA Neptune: In Depth Neptune: In Depth https://solarsystem.nasa.gov/planets/neptune/indepth NASA NASA http://solarsystem.nasa.gov/planets/neptune/indepth says NASA it takes it 165 years to make a single pass says NASA ottavo pianeta http://solarsystem.nasa.gov/planets/neptune/indepth NASA NASA it takes it 165 years to make a single pass NASA NASA NASA NASA http://solarsystem.nasa.gov/planets/neptune/indepth NASA NASA