system
Given the following post, respond as if you're commenting on Reddit:
human
What is the maximum size a planet can have before it becomes uninhabitable?

I have wondered this for a while. What is the maximum possible size for a planet to have in the habitable zone of its solar system, for it to still be able to support lifeforms?
gpt
There isn't one.  At a certain point, according to most planet formation theories, the planet will be a gas giant, at which point it becomes a lot harder for life to evolve.

But then there's no a priori reason why it's moons cannot be inhabited.