'A delicate operation': China launched the second of three modules of its space station under construction into space on Sunday, a crucial step towards finalizing the installation.
The craft named Wentian, weighing around 20 tons and without an astronaut on board, was launched by a Long March 5B rocket at 2:22 p.m. (6:22 GMT) from the Wenchang launch center on the tropical island of Hainan (south), according to images from public television CCTV.
Hundreds of enthusiasts had gathered on the surrounding beaches to take photos of the launcher rising in the air in a plume of white smoke.
After about eight minutes of flight, “Wentian successfully separated from the rocket to place itself in the planned orbit”, welcomed the space agency in charge of the manned space flights (CMSA), describing the launch as a “total success”.
Nearly 18 meters long and 4.2 meters in diameter, this laboratory module is due to dock at Tianhe, the station's first module, which has already been in orbit since April 2021.
The docking operation is a challenge for the crew, as it requires several successive, high-precision manipulations, especially with a robotic arm.
“It's the first time that China has had to dock such large vehicles together” and “it's a delicate operation,” Jonathan McDowell, astronomer at the Harvard-Smithsonian Center for Astrophysics, told AFP. States.
A manipulation that will have to be repeated with the arrival later in 2022 of a new laboratory module.
In the end, “this will allow the station to be much more capable, with the space and power to do more science experiments,” says McDowell.
Featuring three sleeping spaces, a toilet and a kitchen, Wentian will serve as a backup platform to control the station in the event of a failure.
The module also has spaces for science experiments and includes a airlock which will become the preferred passage for spacewalks.
Named in Chinese Tiangong (“Heavenly Palace”), but also known by its acronym CSS (for “Chinese space station” in English), the Chinese space station should be fully operational by the end of the year. < /p>
After Wentian this weekend, the three astronauts of the Shenzhou-14 mission, currently on the space station, will welcome the third and final module, Mengtian, there in October.
The station will then have its final T-shaped shape. It will be similar in size to the defunct Russian-Soviet Mir station. Its lifespan should be at least 10 years, possibly 15 years.
“The CSS will then have completed its construction in just a year and a half, the fastest pace in history for a modular space station,” said Chen Lan, analyst at the Go Taikonauts.com site, specializing in the Chinese space program.
“In comparison, the construction of Mir and the International Space Station (ISS) took 10 and 12 years respectively. »
Moon and Mars
Completing Tiangong will also allow China to perform, for the first time, a crew relay in orbit. 14, currently on the space station, will give way to those of Shenzhou-15.
Tiangong will then host the six crew members for several days.
The China has been pushed to build its own station due to the refusal of the United States to allow it to participate in the ISS.
The Asian giant has been investing billions of euros in the past decades its space program.
China sent its first astronaut into space in 2003. In early 2019, it landed a spacecraft on the far side of the Moon, a world first.
In 2020, it brought back samples from the Moon and finalized Beidou, its satellite navigation system, a competitor to the American GPS.
E n 2021, China landed a small robot on Mars and plans to send men to the Moon by 2030.