system
A chat on subreddit /r/me_irl
human
What was the expected answer?
gpt
The simple explanation for the Red Planet's color is that its regolith, or surface material, contains lots of iron oxide — the same compound that gives blood and rust their hue. But why does Mars have so much iron, why is that iron "oxidized," and why does iron oxide look red?
  

  
It all started 4.5 billion years ago. When the solar system formed, many of the planets landed a dose of iron. Forged in the heart of long-dead stars, the heavy element swirled around in the cloud of gas and dust that gravitationally collapsed to form the sun and planets.

&amp;#x200B;

This is what I would have answered at age 6