A planet in the center of the system

In most star systems, planets orbit around a star. Is it possible for a planet to be so massive/heavy/dense that a star(and other planets) orbit it instead? Bonus points if the planet is also reasonably life-bearing and rocky.

Largely inspired by this question over here.

Some notes:

• Apparently, from a label standpoint, a planet can only be called a planet if it is unable to ever have potential to achieve fusion. For the purposes of this question, a planet is a planet if it is not a ball of nuclear fire, but preferably rocky. A planet so large that it has a core undergoing fusion would be pretty cool I imagine.
• The planet can but not necessarily be poofed into existence, no need to worry about how such a planet is formed, only that it stays formed/stable for a reasonable amount of time(billions of years)
• The star that is orbiting the planet can be of any type.

posted over 9 years ago

grimmsdottir‭

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