China's Tianwen-3 advances as NASA's Mars Sample Return is cancelled
With US funding cut in January, China could be first to return Martian samples, by 2031
Summary
The Mars sample-return race has flipped. NASA's Mars Sample Return, over a decade in development, with projected costs above $11B, was effectively cancelled when Congress declined to fund it in the January 2026 appropriations. Meanwhile China's Tianwen-3 has moved into the flight-model/construction phase, on track to launch in 2028, drill ~2 m, collect ≥500 g of Martian material and return it by 2031. China has made the mission unusually open, reserving 20 kg for international instruments, selecting five international cooperation projects in April 2026, and pledging sample access. If schedules hold, China would become the first nation to return material from another planet, potentially years before any revived US or Western effort, a symbolic shift in planetary-exploration leadership.
By the numbers
- 2028 → 2031, Tianwen-3 launch to sample return.
- ≥500 g, Martian material targeted, drilled to ~2 m depth.
- 20 kg, payload mass reserved for international instruments.
- $11B+, projected NASA MSR cost before Congress cut its funding.
Why it matters
Returning Martian samples, possibly containing biosignatures the Perseverance rover already cached, is a marquee scientific and prestige prize. The US ceding it mid-stream while China advances marks a turn in the broader space competition, and reframes who sets the agenda in deep-space exploration.
What to watch
- Tianwen-3 flight-model completion and 2028 launch readiness.
- Any US move to revive a cheaper sample-return architecture.
- Which Western scientists accept seats on China's mission.