In an infinite universe you're bound to get some oddities now and again - few are as cool as a quintuple star system, featuring both a detached binary and a contact binary as well as a lone fifth.
Just one of the many cool things turned up by the SuperWASP and Kepler in their search for exoplanets! I expect we'll see more of this kind of thing as TESS and other projects come online.
Astronomers have discovered a very rare system of five connected stars. The quintuplet consists of a pair of closely linked stars - binaries - one of which has a lone companion; it is the first known system of its kind. The pair of stars orbit around a mutual centre of gravity, but are separated by more than the distance of Pluto's orbit around the Sun.