# Mars Exploration
Confidence: high
Last verified: 2026-05-22
Generation: ai_assisted


## TL;DR

Mars is the most explored planet beyond Earth. First flyby (Mariner 4, 1965). Key missions: Viking (first landing, 1976), Pathfinder/Sojourner (first rover, 1997), Spirit/Opportunity (2004, Oppy lasted 14 years — 45km), Curiosity (2012, still active, nuclear-powered), Perseverance (2021, collecting samples for return). Evidence of past liquid water is overwhelming.

## Core Explanation

Why Mars: most Earth-like planet, past habitability, potential for ancient life. Perseverance: Jezero Crater (ancient river delta), Ingenuity helicopter (first powered flight on another planet — 72 flights). Sample return: NASA/ESA Mars Sample Return mission (planned 2030s). Challenges: radiation, thin atmosphere (1% of Earth), perchlorates in soil (toxic). Human missions: SpaceX Starship, NASA — 2030s target.

## Further Reading

- [NASA Mars Exploration Program](https://mars.nasa.gov/)