It is expected that the decommissioned and allegedly out-of-control Tiangong 1 space station will return to Earth's atmosphere sometime this weekend. It poses little risk to people and property on the ground, as most of the 8.5-tonne bus vehicle is burned upon reentry into the city, although space agencies are not sure when and where that will happen  Below are some questions and answers about the station, its reentry and the past and future of China's ambitious space program.
WHAT WILL HAPPEN AND HOW BIG IS THE DANGER?
The European Space Agency predicts The station will re-enter the atmosphere between Saturday morning and Sunday afternoon – an estimate she calls "highly variable", probably because the ever-changing shape of the upper atmosphere affects the speed of the objects falling into it ,
The Chinese Space The Agency's latest estimate is a re-entry between Saturday and Wednesday.
Western space experts say they believe China has lost control of the station. Zhu Zongpeng, China's Chief Space Laboratory, denied that Tiangong was out of control, but did not specify what China would do to control the ship's re-entry.
Based on the orbit of Tiangong 1
Due to its size, only about 10 percent of the spacecraft is likely to be survived on reentry, especially its heavier components such as the engines. The likelihood of being hit by rubble on Earth is considered less than one to one trillion.
Ren Guoqiang, Chinese Ministry of Defense spokesman, told reporters on Thursday that Beijing has informed the United Nations and the international community about Tiangongs 1
HOW TOGETHER IS MAN-MADE SPACE DEBRIS?
Debris from satellites, space launches and the International Space Station enter the atmosphere every few months, but only one person is known for it American Lottie Williams, who died in 1997 in an Oklahoma Park from a falling piece of a US Delta II Missile hit but was not hurt.
America's 77-tonne Skylab is most famous for its 1979 atmosphere of spreading debris near the city of Perth in southwestern Australia, which punishes the $ 400 for garbage.
The resolution of the reentry of the Columbia Space Shuttle in 2003 killed al I have seven astronauts and sent more than 80,000 debris on a large strip of southern United States. No one on the ground was injured.
In 2011, the NASA Atmospheric Research Satellite was considered a slight public risk when it came to Earth 20 years after its launch. Wreckage of the 6-ton satellite landed in the Pacific Ocean and caused no damage.
China's own space program was a source of concern after a missile killing a Chinese satellite that was out of service in 2007 and a potentially dangerous debris cloud.
WHAT IS TIANGONG 1 AND WHAT IT HAS BEEN USED FOR?
Tiangong 1 was launched in 2011 and was China's first space station, which started as an experimental platform for larger projects such as the Tiangong 2 in September 2016 and a future permanent Chinese space station.
The station, whose name means "Heavenly Palace", hosted two manned missions that included China's first female astronaut and served as a test platform for perfect docking procedures and other operations. The last crew left in 2013 and contact was interrupted in 2016. Since then, they are increasingly circling the earth while they are being monitored.
The station had two modules, one for their solar cells and motors and one for an astronaut couple to live in and perform experiments. A third astronaut slept in the Shenzhou spacecraft docking at the station, which also included personal hygiene and food preparation facilities.
HOW EXTENDS CHINA'S SPACE PROGRAM?
Since China launched its first manned mission in 2003 – becoming only the third country after Russia and the US – it has been making more and more ambitious projects, including a spacewalk and the landing of its jade-rabbit rover on the moon ,
China is now operating the precursor space station Tiangong 2, while the 20 ton core module of the base station will hit the market this year. The completed 60-tonne station is scheduled to go into operation in 2022 and remain operational for at least a decade.
China was ruled out of the 420-tonne International Space Station, mainly due to US legislation that prohibits such cooperation and concerns about the Chinese military connections of the space program. China's space program is still very secretive and some experts have complained that a lack of information about Tiangong 1's design makes it harder to predict what might happen when it rejoins.
A mission to land another rover on Mars and bring back samples is scheduled to start in 2020. China also plans to become the first country to land a probe on the other side of the moon.
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