system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] So, Hoth must be pretty warm, far as planets go, right?

Sure, the entire surface is frozen, but it can support life on the surface, meaning it can't be colder than Earth's polar regions. Although Earth's polar regions are extreme to us, they're quite bearable far as extremes in the solar system. The characters can breath on Hoth, meaning the ice and snow is simply water, not only that, but they survive with their faces uncovered. In our own solar system, Mars alone is cold enough to have frozen carbon dioxide in its polar region, Titan is cold enough to have liquid methane lakes, and Neptune's moon Triton has frozen nitrogen on its surface. All in all, Hoth is pretty warm for an ice planet.
gpt
Yeah, it could be on the outer edge of the habitable zone. 

Atmospheres trap heat, so maybe Hoth is like Earth but with a thin, but breathable, atmosphere. 

I think Mars could be habitable if it had an atmosphere as thick as Earths, with an ozone layer too.

Either way, the areas we see in the movie must be the temperate or tropical areas of the planet. The poles may be too cold to support life.