China spacecraft returns amid threat of booster rocket crashing on Earth

A Chinese cargo spacecraft that serviced the country's permanent orbiting space station has largely burned up on reentering the atmosphere, amid separate concerns over China's decision to allow a massive booster rocket to fall to Earth uncontrolled.

Only small parts of the Tianzhou-3 ship survived to fall safely Wednesday into a predetermined area of the South Pacific. (AFP)

A Chinese cargo spacecraft that serviced the country's permanent orbiting space station has largely burned up on reentering the atmosphere, amid separate concerns over China's decision to allow a massive booster rocket to fall to Earth uncontrolled.

Only small parts of the Tianzhou-3 ship survived to fall safely Wednesday into a predetermined area of the South Pacific, the China Manned Space Agency said.

Until July 17, the spacecraft had been docked with the station's Tianhe core section and its return follows the addition of a laboratory module on Monday as China moves to complete the station in the coming months.

China's space program is run by the ruling Communist Party's military wing, the People's Liberation Army, and has largely proceeded with the space station program without other nations' assistance. The U.S. excluded China from the International Space Station because of its military ties.

The booster that has drawn attention from the space community was part of the massive 23-ton Long March 5B-Y3 rocket — China's most powerful — that carried the Wentian module to the station, aboard which three astronauts currently reside.

China decided not to guide the booster back through the atmosphere and it's not clear exactly when or where it will come down to Earth. While it will largely burn up on return, there remains a slight risk of fragments causing damage or casualties.

While China is not alone in such practices, the size of the Long March rocket stage has drawn particular scrutiny.

China has allowed rocket stages to fall back to Earth on their own at least twice before, and was accused by NASA last year of “failing to meet responsible standards regarding their space debris" after parts of a Chinese rocket landed in the Indian Ocean.

China also drew heavy criticism after using a missile to destroy one of its defunct weather satellites in 2007, creating a massive debris field.

Foreign Ministry spokesperson Zhao Lijian on Wednesday rejected such concerns.

“Since the development stage of the space engineering program, China has taken into consideration the debris mitigation and return from orbit into atmosphere of missions involving rocket carriers and satellite sent into orbit," Zhao said at a daily briefing Wednesday.

“It is understood that this type of rocket adopts a special technical design that most of the components will be burnt up and destroyed during the reentry process," Zhao said. “The possibility of causing damage to aviation activities or on the ground is extremely low."