Tiny, unseen moon could be holding bizarre space rock Chariklo's rings in place 

 A little moonlet, too small to be seen from Earth, could be playing cosmic sheepdog by shaping the thin rings around the distant minor planet Chariklo, according to new computer simulations. 

https://cdn.mos.cms.futurecdn.net/ZCQd3SP95chn8DuidHTVYF.jpg

https://www.space.com/chariklo-centaur-rings-shaped-by-tiny-moon