What would happen with a supermassive planet?

What would happen to a planet if it was really massive, like something around the size of the sun (likely made of asteroid materials)? What kind of environment might it have? What would happen to an atmosphere (if it actually had one, and it didn't just turn solid from the immense gravity)? Could it turn into something like a star that could burn really heavy materials? etc...

Also, I would preferably like to know both how it being rogue and in a solar system might also effect it. The solar system wouldn't really need to be ours.

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What would happen with a supermassive planet?

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