NASA's Mars Exploration Strategy: From Curiosity to Crewed Landing

NASA has been continuously exploring Mars since Mariner 4 flew past in 1965. Today, three orbiters, two rovers, and a helicopter are operating there, with Sample Return on the way and a crewed mission in long-term planning. Here is the strategy from rover to red planet astronaut.

The rover lineage

• Sojourner (1997) — proof that wheeled robotics could explore Mars.
• Spirit and Opportunity (2004) — designed for 90 sols, operated for years (Opportunity, 14+ years).
• Curiosity (2012) — nuclear-powered, car-sized lab. Still active.
• Perseverance (2021) — Curiosity's successor with sample caching, plus the Ingenuity helicopter sidekick.

The science arc

Each rover answers a different question: Was there water? (Spirit/Opportunity). Was there habitability? (Curiosity). Was there life? (Perseverance, via samples to be returned). Future rovers and the eventual Sample Return campaign close the loop on the long-running search for past Martian life.

Mars Sample Return

The most ambitious robotic mission ever attempted: launch a rocket from Mars, rendezvous in Mars orbit, and bring sealed samples back to Earth. NASA and ESA are partners. The cost has grown significantly, leading to ongoing replans for affordability.

Active surface assets

Curiosity, Perseverance

Active orbiters

MAVEN, Mars Reconnaissance Orbiter, Mars Odyssey

Total Mars budget annually

~$2-3 billion across all programs

Crewed Mars mission

No firm date — long-term goal, mid-2030s+

Sample return target

Early 2030s

Crewed Mars: the long arc

Artemis is the proving ground for the technology and operations needed to send humans to Mars: deep-space crew vehicles, surface habitats, life support, EVAs, and resource utilization. SpaceX's Starship is sized for Mars and is being designed accordingly. NASA's Mars architecture is in active formulation.