A group of stars very close together as seen from the earth, especially one whose members are in fact close together and rotate around a common center.
- ‘Most stars are actually binary or multiple stars.’
- ‘They're systems of multiple stars so far from Earth that to the naked eye, each system appears to be a single entity.’
- ‘It transpires that in this region of our galaxy, binary and multiple star systems are more common than singletons like our Sun.’
- ‘Of the first 450 pulsars discovered, only seven were definitely in a binary system, despite the fact that most O-stars, the precursors of pulsars, are in multiple star systems.’