Tianwen-1
China's first independent voyage to the Red Planet
Tianwen-1 (天问一号, also called TW-1) is a Chinese interplanetary mission that sent a robotic spacecraft to Mars. The spacecraft, built by the China Aerospace Science and Technology Corporation and managed by the National Space Science Centre in Beijing, consists of six elements: an orbiter, two deployable cameras, a lander, a remote camera, and the Zhurong rover. With a total mass of nearly five tons, it is among the heaviest probes ever sent to Mars and carries 14 scientific instruments. It is the first mission in CNSA's Planetary Exploration of China program.
The mission aims to study Martian surface geology and internal structure, search for evidence of past or present water, and characterize the planet's space environment and atmosphere. China's Mars program originally began in partnership with Russia: in November 2011, the Russian Fobos-Grunt spacecraft, carrying China's Yinghuo-1 orbiter, launched from Baikonur but failed to leave Earth orbit, reentering the atmosphere in January 2012. China then started an independent Mars project in 2014, formally approved in 2016.
On 14 November 2019, CNSA invited foreign embassies and organizations to witness a hovering and obstacle avoidance test for the Mars lander—the mission's first public appearance. In April 2020, the mission was officially named Tianwen-1, after a poem by Qu Yuan (c. 340–278 BC) whose title means "Questions to Tian" (the sky or heavens). The rover was named Zhurong, after a Chinese mytho-historical figure associated with fire and light, chosen through an online poll from January to February 2021.
The spacecraft launched from Wenchang Spacecraft Launch Site on 23 July 2020 atop a Long March 5 heavy-lift rocket. During its seven-month cruise, it performed four trajectory correction maneuvers, an additional inclination adjustment, and self-diagnostics on its payloads. In September 2020, it deployed the Tianwen-1 First Deployable Camera (TDC-1), a small satellite with two cameras that photographed the orbiter and lander's heat shield and tested radio contact; its trajectory was predicted to fly by Mars around orbit insertion.
Tianwen-1 entered Martian orbit on 10 February 2021, then spent three months studying landing sites from reconnaissance orbit. On 14 May 2021, the lander and rover touched down, making China the third nation to soft-land on Mars and establish communication from the surfac
- Launch date
- 23 July 2020
- Mars orbit insertion
- 10 February 2021
- Landing date
- 14 May 2021
- Rover deployment
- 22 May 2021
- Operator
- China National Space Administration (CNSA)
- Mission type
- Mars orbiter, lander, and rover
- Total mass
- Nearly five tons
Quick Facts
- Names List
- zh · Huoxing · italic=no-1 (zh · 火星-1) (2018–2020)
- Mission Type
- Mars exploration
- Operator
- CNSA
- Satcat
- 45935
- Spacecraft
- Orbiter · lander · zh · Zhurong · 2 zh · Tianwen · italic=no-1 Deployable Cameras (TDCs) · zh · Tianwen · italic=no-1 Remote Camera (TRC)
- Manufacturer
- SAST / CAST
- Launch Mass
- Total: 5000 kg · Orbiter: 3715 kg · zh · Zhurong: 240 kg
- Dimensions
- zh · Zhurong: 2.6 x
- Launch Date
- 23 July 2020, 04:41:15 UTC
- Launch Rocket
- Long March 5 (Y4)
- Launch Site
- Wenchang LC-101
- Insignia
- China Mars Exploration Mission Logo-2.png
Facts from the source article.
Lore & Background
Tianwen-1 was launched from the Wenchang Spacecraft Launch Site on a Long March 5 heavy-lift launch vehicle. After seven months of transit, it entered Martian orbit on 10 February 2021. For three months it studied target landing sites from reconnaissance orbit before the lander/rover portion touched down in Utopia Planitia on 14 May 2021. The Zhurong rover drove onto the surface on 22 May 2021 via descent ramps, making China the second nation to deploy a rover on Mars, after the United States.
The mission carried 14 scientific instruments and aimed to investigate Martian surface geology, internal structure, water presence, and the space environment and atmosphere. A deployable camera (TDC-1) photographed the orbiter and lander's heat shield during cruise. A separate remote camera was deployed on the surface in June 2021, after the Zhurong rover had already begun its exploration. As of 2021, no audio recordings from Tianwen-1 or Zhurong have been confirmed; the only confirmed Martian audio recordings from that year came from NASA's Perseverance rover.
Reader's Guide
Tianwen-1 is historically significant as China's first independent interplanetary mission and the first to successfully orbit, land, and deploy a rover on Mars on its maiden attempt. It made China the third nation to soft-land on Mars and the second to operate a rover there. The mission also captured the second audio recordings on the Martian surface, after NASA's Perseverance rover. Its scientific objectives included studying Martian geology, water ice distribution, atmospheric characteristics, and internal structure. The mission was awarded the World Space Award by the International Astronautical Federation in September 2022. Tianwen-1 was the second of three Martian missions launched in the July 2020 window, after the UAE's Hope orbiter and before NASA's Mars 2020 mission. Its success demonstrated China's deep space communication and control technologies, paving the way for future planetary exploration under the Tianwen series.
Did You Know?
- Tianwen-1 is named after a poem by Qu Yuan (c. 340–278 BC) titled 'Questions to Tian'.
- The Zhurong rover is named after a Chinese mytho-historical figure associated with fire and light.
- The remote camera deployed by Zhurong weighed less than 1 kg, making it the lightest artificial object on Mars as of May 2021.
- Tianwen-1 was the second mission to capture audio recordings on the Martian surface, after NASA's Perseverance rover.
Frequently Asked Questions
What is Tianwen-1?
Tianwen-1 (TW-1) is China's first fully independent robotic mission to Mars, combining an orbiter, a lander, and a surface rover in a single spacecraft. It was developed under the China National Space Administration's Planetary Exploration of China program.
What components make up the Tianwen-1 spacecraft?
The vehicle is assembled from six main parts: an orbiter, two deployable cameras, a lander, a remote camera, and the Zhurong rover. Together they weigh close to five metric tons and carry fourteen scientific instruments for studying the Martian environment.
When did Tianwen-1 reach and land on Mars?
After launching on 23 July 2020, the spacecraft was captured into Mars orbit on 10 February 2021. The lander touched down on 14 May 2021, and the Zhurong rover was driven onto the surface eight days later, on 22 May 2021.
Why is Tianwen-1 considered a landmark mission?
It marks the first time China sent a crewed-free probe to another planet on its own, making it the inaugural flight in CNSA's broader planetary-exploration roadmap. Its near-five-ton mass also places it among the heaviest Mars probes ever launched.
Who built and manages Tianwen-1?
The spacecraft was engineered by the China Aerospace Science and Technology Corporation, while day-to-day mission management falls to the National Space Science Centre in Beijing. Overall program authority rests with the China National Space Administration.
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