Did you know that more than two-thirds of stars are part of multiple systems, where two or more stars orbit a common center of Gravity?  This means that the Sun is one of the minority, being on its own.  Most of the multiple systems out there are in fact double star systems, but some of them are triples and a few are quadruples.  One such quadruple star system, known as DI Cha (in the chameleon constellation), was recently imaged by Hubble. The system lies in the southern constellation of Chameleon, about 520 light years away.  The quadruple system is a...