system
Given the following post, respond as if you're commenting on Reddit:
human
What keeps Jupiter, a gas giant, from collapsing under its own gravity and becoming a dense solid?
gpt
Hydrostatic equilibrium is what you want to look into. It's what keeps big round things round, from planets to stars.

In Jupiter's case, the gas at the center is hot from the extreme pressure exerted by gravity. The heat and pressure causes the gas to rise, so there's an equilibrium between gravity pulling down and the heat and pressure pushing out.