# Rusty Martian crust may have helped keep early Mars warm and wet

Researchers suggest that an iron-rich, rusty crust on early Mars helped trap heat and maintain liquid water. The idea could help explain how Mars stayed warm and wet despite the faint young Sun.

**Importance:** 3/5

## Sources

### Science
- [New Scientist](https://www.newscientist.com/article/2596726-rusty-crust-made-mars-warm-and-wet/?utm_campaign=RSS|NSNS&utm_content=home&utm_medium=RSS&utm_source=NSNS) — Fri, 30 Oct 2026 15:00:00 +0000