[Mr. K]

I wonder how many ‘solar systems’ exist where the central ‘star’ never ignited.

Just large planet-sized objects orbiting each other.

[Calvin Locke]

There are "green" "stars". Green, because the color name was available...

Any way, it's larger than Jupiter, but smaller than a brown dwarf. Also has a temperature range associated with it.

[GraceG]

Jupiter is already a mini solar system