This rare star system has 6 'sub-Neptune' exoplanets with mathematically perfect orbits 

 A newfound, and impressively well-maintained, planetary system full of sub-Neptunes could reveal why our solar system lacks such a world. 

https://cdn.mos.cms.futurecdn.net/4ufhNmeyC5WYSj8k6BTYXU.jpg

https://www.space.com/six-sub-neptunes-found-100-light-years-from-earth