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Jan21-05, 06:50 PM
Sci Advisor
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Chronos's Avatar
P: 9,454
The picture gets a little blurry as you add more stars. There is no particular criteria for differentiating a system from a cluster. Globula clusters are gravitational bound systems that can include millions of stars. I'm curious though, in using the term solar system I had the impression you were asking whether planetary systems are known to occur in multiple star systems. Far as I know, a few are suspected in binary star systems, but not beyond that. It is not easy for a low mass object like a planet to occupy a stable orbit in a binary star system. Having two stars is bad enough, more than two would be a computational nightmare.