| 中国行星探测 Zhōngguó Xíngxīng Tàncè | |
 Emblem of Planetary Exploration of China Reaching for the Planets | |
| Program overview | |
|---|---|
| Country |  China |
| Organization | China National Space Administration (CNSA) |
| Purpose | RoboticInterplanetary mission |
| Status | Ongoing |
| Program history | |
| Duration | 2016–present |
| First flight | Tianwen-1, July 23, 2020, 04:41 (2020-07-23UTC04:41Z) UTC |
| Last flight | Tianwen-2, May 28, 2025, 17:31 (2025-05-28UTC17:31Z) UTC |
| Successes | 2 |
| Failures | 0 |
| Launch site(s) | Wenchang Spacecraft Launch Site Xichang Satellite Launch Center |
| Vehicle information | |
| Launch vehicle | Long March rockets |
ThePlanetary Exploration of China (PEC;Chinese:中国行星探测;pinyin:Zhōngguó Xíngxīng Tàncè), also known asTianwen (Chinese:天问;pinyin:Tīanwèn;lit. 'Questions to Heaven'), is theroboticinterplanetary spaceflight program conducted by theChina National Space Administration (CNSA). The program aims to explore planets of theSolar System, starting fromMars, and will be expanded toJupiter and more in the future.[1]
The program was initially known as the Mars mission of China at the early stage.[2] It was later announced as Planetary Exploration of China in April 2020. The series of missions was namedTianwen.[3]
The first mission of the program,Tianwen-1 Mars exploration mission, began on July 23, 2020. A spacecraft, which consisted of an orbiter, a lander, and a rover, was launched by aLong March 5 rocket fromWenchang.[4] The Tianwen-1 was inserted intoMars orbit in February 2021 after a seven-month journey, followed by a successfulsoft landing of the lander andZhurong rover on May 14, 2021,[5] making China the second country in the world to successfully soft-land a fully operational spacecraft on Mars surface after the United States.
Future missions, including Mars sample return and Jupiter system exploration, have been planned by PEC.[6]
China began its first interplanetary exploration attempt in 2011 by sendingYinghuo-1, a Mars orbiter, in a joint mission with Russia. Yet it failed to leave Earth orbit due to the failure of Russian launch vehicle.[7]
On December 13, 2012, the Chinese lunar probeChang'e 2 made a flyby of the asteroid4179 Toutatis in an extended mission.[8] With a distance of over 7 million kilometers away from Earth, Chang'e 2 became China's first interplanetary probe which tested the limit of China's deep space communication capability.[9]
On April 22, 2016,Xu Dazhe, head of the CNSA, announced that the Mars mission had been approved on January 11, 2016. A probe would be sent to Martian orbit and attempt to land on Mars in 2020.[2]
On November 14, 2019, CNSA invited some foreign embassies and international organizations to witness hovering and obstacle avoidance test for Mars Lander of China's first Mars exploration mission at theextraterrestrial celestial landing test site. It was the first public appearance of China's Mars exploration mission.[10]
On April 24, 2020, Planetary Exploration of China was formally announced by CNSA, along with the name "Tianwen" and emblem of the program.[11] The first mission of the program, the Mars mission to be carried out in 2020, was namedTianwen-1.[3]
The first mission of the program, Tianwen-1 Mars exploration mission, was launched on July 23, 2020.[4] The Tianwen-1 was inserted into Mars orbit in February 2021 after a seven-month journey, followed by a successful soft landing of the lander andZhurong rover on May 14, 2021.[5] TheZhurong rover was deployed onto theMartian surface from its landing platform and began its exploratory mission on May 22. On June 1, CNSA released multiple high-resolution images taken on Martian surface, confirming the success of the mission.[12]
On June 12, 2021, CNSA announced the future plans for near-Earth asteroid sample return, Mars sample return and Jupiter system exploration.[13]
The program's name "Tianwen", which literally means "questions to heaven", derived fromthe eponymous poem by the famous ancient poetQu Yuan of the state ofChu during theWarring States period (475–221 BC). The name is said to represent the Chinese people's relentless pursuit of truth, the country's cultural inheritance of its understanding of nature and universe, as well as the unending explorations in science and technology.[3]
The emblem of PEC and its missions consist of eight planets in the Solar System and their orbits in the shape of the Latin letter 'c', referring to China, cooperation, and the cosmic velocity required to undertake planetary exploration.[1]
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Wenchang Spacecraft Launch Site is China's newest space vehicle launch facility. It is the only launch site in China capable of launching China's most powerful rocketLong March 5, which offers the maximum payload capacity into deep space.
Tianwen-1, the first mission of PEC, was launched from Wenchang.
Tianwen-2, the second mission of PEC, was launched from Xichang aboard aLong March 3B rocket.
TheChinese Deep Space Network provides tracking, telemetry and command (TT&C) capability to the interplanetary spaceflights. Participating facilities include:[15][16]
Located inHuailai County,Hebei, the extraterrestrial celestial landing test site is the largest facility of this kind in Asia.[10]
The facility consists of six 140-meter tall cranes and one central platform, which is connected with the cranes by 36 cables. The movement of the platform provides simulation of the Mars gravity environment to the lander hung below it. The ground of is paved with special material, which can be manipulated to form pits or slopes.[17]
The extraterrestrial celestial landing test site is used to test the lander's capability of hovering, obstacle avoidance and slowing down.
As China's first independentMars exploration mission, Tianwen-1 set out to accomplish three major goals simultaneously: orbiting, landing on, and roving Mars via a single set of spacecraft.[18] On July 23, 2020, the Tianwen-1 spacecraft stack, consisting of an orbiter, a lander, a rover, deployable and remote cameras launched fromWenchang, marking the beginning of the mission.[4]
After a 202-day journey through interplanetary space, Tianwen-1 inserted itself into Martian orbit on February 10, 2021, thereby becoming China's first Mars orbiter. During this long journey, it deployed a deployable camera in September 2020 whose imagery confirmed the successful launch and Mars transit phase of the spacecraft.[19] Subsequently, it performed several orbital maneuvers and began surveying target landing sites on Mars in preparation for the coming landing attempt.
On May 14, 2021, the lander and theZhurong rover separated from Tianwen-1's orbiter. After experiencingMars atmospheric entry that lasted about nine minutes, the lander and rover made a successful soft landing in theUtopia Planitia region of Mars.[5] With the landing, China became the second country to operate a fully functional spacecraft on Martian surface, after the United States.
On May 22, 2021, theZhurong rover deployed onto the Martian surface from its landing platform and began its exploratory mission. During its deployment, the Rover's instrument, Mars Climatic Station (MCS), recorded the sound, acting as the second Martian sound instrument to record Martian sounds successfully afterMars 2020Perseverance rover's microphones. During this journey it deployed the remote selfie camera on June 1, 2021, whose imagery confirmed the successful landing of the rover and lander.[12] Later on, the orbiter released another deployable camera in Mars Orbit on December 31, 2021 who imaged the orbiter and Utopia Planitia where Zhurong rover is operating and an unknown selfie stick payload was deployed to working position on orbiter to image orbiter's key components and Chinese flag on orbiter on January 30, 2022, forChinese New Year.
The mission toreturn samples from anear-Earth asteroid and to orbit amain-belt comet is planned to be conducted around 2025, according to CNSA announcement on June 12, 2021.[6]
On May 28, 2025, the Tianwen-2 spacecraft, consisting of an orbiter, a return module, deployable and remote cameras launched fromXichang, marking the beginning of the first asteroid exploration mission of China.[20]
In December 2020, the CNSA announced plans for aMars sample-return mission to be carried out later in the decade.[21] In a June 2022 announcement, the mission's name was revealed to beTianwen-3 and further details were announced, including a 2028 launch date for a 2031 return to Earth.[22] One spacecraft would land on the martian surface to collect samples and send the material back to Martian orbit. A second spacecraft would take the samples which would then be carried by a return capsule back to earth.[23][24]
In 2022, the CNSA revealed VOICE (Venus Volcano Imaging and Climate Explorer), an orbiter mission to launch in 2026 and arrive at Venus in 2027. This mission is expected to last 3-4 years and include the following payloads, a Microwave Radiometric Sounder (MRS), Polarimetric Synthetic Aperture Radar (PolSAR), and Ultraviolet-Visible-Near Infrared Multispectral Imager (UVN-MSI). VOICE would return images of the surface with one-meter resolution and search the clouds for habitability and biosignatures.[25][26]
According to the National Space Science Medium- and Long-Term Development Plan (2024-2050), the mission was not selected for development. It was replaced by a Venus atmosphere sample return mission, but no details or timelines were announced.[27]
China is planning a mission toJupiter and possibly to the Jovian moonCallisto. One of two possible mission architectures ("Jupiter Callisto Orbiter" and "Jupiter System Observer") will likely be launched in 2029 and arrive at the Jovian system in 2035, after oneVenus flyby and two Earth flybys.[28] The mission will also include an additional probe that will conduct aflyby ofUranus sometime after 2040.[29][30]
According to Wang Xiaojun, head of the state-owned China Academy of Launch Vehicle Technology, China plans to send its first crew to Mars and planning base for regular crewed missions, primary launches to Mars are planned for 2033, 2035, 2037, 2041.[31]
| Mission | Launch date (UTC) | Launch site | Launch vehicle | Spacecraft | Orbital insertion date (UTC) | Landing date (UTC) | Landing location | Operational time | Status | Notes |
|---|---|---|---|---|---|---|---|---|---|---|
| Tianwen-1 | July 23, 2020 04:41:15 | Wenchang | Long March 5 | Tianwen-1 orbiter | February 10, 2021 11:52 | – | – | 1747 days | Operational | |
| Tianwen-1 lander | May 14, 2021 23:18 | Utopia Planitia 25°06′N109°54′E / 25.1°N 109.9°E /25.1; 109.9 | 3 hours | Success | No payload except ablack box was on the lander. Reached end of designed lifespan after landing. | |||||
| Zhurong rover | 358 days[32] | Success | Deployed onto the Martian surface on May 22, 2021. Stopped communicating on 20 May 2022 after entering winter hibernation. |
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