system
Given the following post, respond as if you're commenting on Reddit:
human
[The Expanse] Why get Martians problems when they look up at the terrestrial sky?

I understand that the change of gravity affecting strongly on their stomachs and well being. I don't understand why they should not to look at the terrestrial sky since they also have a Sky on Mars...
gpt
Martians have only ever seen their sky through a window or monitor. They've grown so accustomed having a thin layer of glass separating them from the outside world (that they've always viewed as dangerous) that not having it can be overwhelming to their senses. 

Martians and Belters both have a degree of agoraphobia.