Tianwen-3 Mars Sample-Return Launch

What this countdown tracks

Launch of Tianwen-3 (天问三号), the China National Space Administration's dual-launch Mars sample-return mission, targeting a late-2028 window — provisionally end of November 2028 — from the Wenchang Space Launch Site on Hainan Island. If the mission holds schedule it will return the first ever Martian samples to Earth, around 2031, several years ahead of the reorganised NASA-ESA Mars Sample Return programme.

About the mission

Tianwen-3 splits the campaign across two Long March 5 rockets launched in close succession. One vehicle carries the lander/ascent stack — a sampler, a Mars-Ascent Vehicle and an orbiter — and the other carries the orbiter/Earth-return vehicle. The lander touches down in a southern-hemisphere mid-latitude site selected for biosignature potential, scoops 500–1,000 grams of regolith and atmospheric gas, and the ascent vehicle lifts the samples to Mars orbit. There they rendezvous with the return spacecraft for the cruise back to Earth.

CNSA published the mission baseline at the 2024 Deep Space Exploration Conference in Hefei. Site selection candidates include Chryse Planitia and Utopia Planitia, the latter near the still-operational Zhurong rover landing zone.

Significance

• First Mars sample return. No agency has yet returned material from Mars; the Apollo lunar samples remain the only extraterrestrial planetary samples in long-term curation.
• Geopolitical inflection. A successful Tianwen-3 would mark China's clear lead on a marquee deep-space milestone the United States has pursued since the 1970s.
• Astrobiology. Sealed, contamination-controlled return of Martian regolith would be a generational dataset for biosignature search.
• Schedule pressure on NASA. The current NASA-ESA MSR architecture is targeted no earlier than 2035 after a 2024 cost-and-schedule reset.

Past Mars campaigns

• Tianwen-1 (2020 launch / 2021 arrival) — orbiter, Zhurong rover and lander.
• Tianwen-2 (2025 launch) — sample return from near-Earth asteroid Kamoʻoalewa.
• Mars 2020 / Perseverance (NASA, 2020) — caching tubes for an eventual MSR pickup.
• ExoMars Rosalind Franklin (ESA-NASA, slipped to 2028) — astrobiology rover.

How to follow

CNSA publishes mission updates via the China Aerospace News Agency (CANA), Xinhua and the official CNSA portal. NASA Spaceflight, SpaceNews, the Planetary Society and Andrew Jones at SpaceNews provide the most reliable English-language coverage. Launch streams typically appear on CCTV-13 and the CNSA YouTube mirror.

Related countdowns

Pair with Mars opposition 2027, Artemis III launch, and the Perseid storm of August 2028 — the most distinctive deep-space and night-sky events of the decade.

FAQ

When does Tianwen-3 launch? Late 2028 — provisional end-November launch window from Wenchang. When do samples arrive? Around 2031. How much sample mass? 500–1,000 grams, sealed at Mars. Is this before NASA's MSR? Yes — by an estimated 4+ years.