system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How did Mars lose most of its water? Considering the water cycle that I learned in school shows that the same water is used and reused over and over again. I'm curious as to what could cause most of the water in a planet to just disappear.
gpt
The solar wind stripped it of its hydrogen because Mars lacks the magnetic field that the Earth does.

Oxygen, being the skank-ass hoe of elements, found something else to bond to to form a solid oxide.