Have we been wrong about why Mars is red?
However, new analysis of spacecraft observations in combination with novel laboratory techniques shows that Mars’s red colour is better matched by iron oxides containing water, known as ferrihydrite. Ferrihydrite typically forms quickly in the presence of cool water, and so must have formed when Mars still had water on its surface.
https://www.esa.int/Science_Exploration/Space_Science/Mars_Express/Have_we_been_wrong_about_why_Mars_is_redOpen linkView original on lemmy.world
Did you read the article? We know it's rust, but there are many forms of iron oxide that form in different conditions.
It's the ol' gaussian curve meme:
The missing part in OP's excerpt: It was previously assumed that the rust was hematite, which forms in dry conditions.
My completely unfounded theory is Mars’ iron core was puked out all over the ground and the water rusted it away. That turned her red and lost her magnetosphere.
Puked out, like from volcanic eruptions?
Yea. I have no idea if there is evidence of that or not. I never really studied Mars more than, “red planet.”