system
Given the following post, respond as if you're commenting on Reddit:
human
Given how cold the outer Solar System (planets and satellites beyond Jupiter) is, how is it possible for Enceladus to have liquid water oceans? Shouldn't they be frigid ice instead?
gpt
Gravity from Jupiter and Saturn could cause flexing in the mantle, generating heat and allowing a zone that could keep water liquid.  

Internal composition of the cores of the planets could also contribute heat.