http://www.djsadhu.com/the-helical-model-vortex-solar-system-animation/


http://www.djsadhu.com/the-helical-model-vortex-solar-system-animation/



https://www.youtube.com/watch?feature=player_embedded&v=lkWyM-M8o0c

https://www.youtube.com/watch?feature=player_embedded&v=zBlAGGzup48