system
Given the following post, respond as if you're commenting on Reddit:
human
Does metal tarnish/corrode/rust in space?
gpt
Rust is oxidation - specifically known as iron oxide - so the outside of a spaceship would not rust. The inside, however could still rust assuming humans would be occupying that space.

In a vacuum without any other material to react with an object of any material would be inert, subject only to natural processes like radioactive decay, and over extremely long timelines decay of the stable atoms themselves.