CHINA SPACE PROGRAM
Dee Finney's blog
atart date July 20, 2011
Today's date February 21, 2012
TOPIC: CHIINESE SPACE PROGRAM
NOTE: I listened to a Project Camelot program on 2-20-12 Jay Weidner and Kerry Cassidy were discussing a secret Chinese space satellite called LUCID program. Such a thing is very difficult to find of course, but I'm still researching it. however, China is determined to beat everyone else to the Moon so let's see what is going on.
BEIJING, (Xinhuanet) — Chinese aerospace scientists said they had independently developed the country’s Long March series of carrier rockets and they did not need to covet the sensitive space technology of the United States.
Chinese aerospace scientists voiced their complaints here Thursday after the Boeing Company’s Satellite Systems and the Hughes Electronics Corp. agreed on March 5 to pay a 32-million-US-dollar civil penalty levied by the US State Department for charges of illegally sharing sensitive space technology with Beijing.
The penalty involved two failed launches of the commercial communications satellites — the Long March 2E rocket carrying the APSTARII Spacecraft in January 1995 and the Long March 3B rocket carrying the INTECSAT 708 Spacecraft in February 1996 — and the later success which the United States claims resulted from aide by Boeing and Hughes.
Long Lehao, an academician of the Chinese Academy of Engineering and chief designer of the series of Long March 3 carrier rockets, said that “As a participator in the projects, I think it’s necessary to clarify the facts.”
He said less than 10 hours after the INTECSAT 708 Spacecraft exploded early in the morning on Feb. 15, 1996, Chinese scientists made a preliminary judgment on the accident’s cause, which was the changes of inertial reference in the rocket’s control system.
The changes produced wrong information which was sent to the computer-driven control system, which ordered the spacecraft to change course, with disastrous results.
Three months of laboratory analyses followed, which, after 125 ground tests in 12 categories, have fully repeated the accident phenomenon, he said.
After that, Long said, Chinese scientists spent another three months making a total of 256 improvements on the rockets to improve their reliability.
Currently, the Long March series of carrier rockets have made 27 successful launches in a row. As 91 percent of its past launches have been successful, the China-made carrier rockets are next only to the American Delta rockets and the European Ariane rockets, whose success rates stand at 94 percent and 93 percent respectively.
This high success rate has been questioned by the United Statesand attributed to the illegal contribution of US sensitive space technology.
Mu Shan, former deputy general engineer of the Xichang Satellite Launching Center in southwest China’s Sichuan Province who participated in the launches of 14 American satellites between1990 and 1998, said “No Chinese were allowed to enter the working area of American scientists unless joint cooperation or technical support from the Chinese side was required.”
”In both situations, security guards were always present. It was impossible for technicians from either side to share so-called sensitive space technologies,” he said.
According to him, after the launch of the APSTARII Spacecraft failed in 1995, Chinese scientists requested no rocket data from its US partners.
”All our analyses are based on satellite remote data. Instead, we provided them live videotape to facilitate their work.” he said.
“The research and development of a carrier rocket requires complicated technologies,” said Long Lehao. “It is just like a child. Only the mother who gives birth and brings him/her up can well understand his/her temper and merits and demerits.”
The situation is similar to the scientists who directly participate in developing a carrier rocket, he said.
”For researchers from any nation, no matter how superior their understanding capabilities are, it is very difficult for them to know clearly every detail of the rocket,” Long said.
”Its an extraordinary trek for humans to challenge space,” saidLong. “It is a job of high technology and high risks.”
The two scientists expressed deep sorrow for the Feb. 1 catastrophe of the Columbia Spaceship.
”Developments in this sophisticated field may inevitably cost lives. But lessons will be drawn from the failures, which will help the cause progress in a better way,” Long said.
Over the past three decades, China’s Long March carrier rocket series evolved from employing storable to cryogenic propellants and from utilizing tandem configuration to cluster configuration. Initially, they each carried one satellite, but now they carry several satellites each, and even carry an unmanned spaceship.
Currently, the Long March series is able to carry different types of satellites into low earth orbit, Sun-synchro orbit and geosynchrous transfer orbit.
To date, China has completed 22 commercial satellite launches for foreign clients with the Long March series. The country plans to carry out a manned space program and develop deep space exploration technology, so as to gradually establish a new- and high-tech industry based on space technology.
”Technology and knowledge, which should go beyond national boundaries, are the common wealth of the human being. Both the United States and Russia have exerted strenuous endeavors in probing high technologies. China would like to participate in international cooperation on an equal footing,” Long Lehao said. Enditem
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2011-11-12 (China Military News cited from washingtontimes.com and by Jeffrey T. Kuhner) -- President Obama is creating a post-American world - one that is ushering in the dominance of China. Mr. Obama is fostering U.S. economic and military decline while simultaneously empowering Beijing's rise to superpower status. China's communists are on the march. Unless Americans wake up to the growing threat, both internal and external, our victory in the Cold War will have been useless.
This is the disturbing theme of "Bowing to Beijing: How Barack Obama Is Hastening America's Decline and Ushering a Century of Chinese Domination," by Brett M. Decker, editorial page editor of The Washington Times, and William C. Triplett II, a best-selling author and renowned China analyst. Lucid, concise and comprehensively researched, the book is a fire bell in the night. It is a dire warning that China has become what America once was to Great Britain: the ambitious upstart determined to eclipse the global colossus. The result will be not only the end of the American moment, but the triumph of a belligerent authoritarian communism hostile to democracy and the West.
"China's leaders are engaged in a war against America. They view us as a threat to their regime and way of life. Hence, they have embarked on a systematic, long-term program to surpass us militarily, economically and politically," Mr. Decker said in an interview. "They are willing to do anything - purchase our national debt, steal our intellectual property, spend obscene amounts to buy influence in Washington, engage in extensive espionage in our government and large corporations, and sell sensitive missile and nuclear technology to our mortal enemies - to defeat us. And the Obama administration is turning a blind eye."
The authors reveal that Beijing believes it is in a life-and-death struggle against America. For years, China's ruthless communist regime has been committing hostile, aggressive acts - stealing valuable military technology, blatantly violating patent and intellectual property laws, manipulating its currency to artificially boost exports to the United States, lying about the nature and extent of its massive military buildup, sending spies into the highest echelons of our government and private sector, hacking into our computer networks, waging cyberwarfare, purchasing stakes in major banks, and cultivating our economic dependence on Chinese business.
In response, Mr. Obama has embraced the Chinese dragon. In January 2011, he acceded to Chinese demands and gave a state dinner honoring President Hu Jintao. Mr. Obama praised Mr. Hu as a statesman and welcomed China's prominent role in world affairs. It was a craven surrender. The authors point out that while he was communist party chief in Tibet, Mr. Hu oversaw the slaughter of hundreds of Tibetan Buddhist monks. Moreover, he has ruled China with an iron fist. Thousands of dissidents have been murdered or rot in jail. The media is heavily censored. Free speech is nonexistent. Basic human rights are abrogated routinely. The country's Christians, Falun Gong and Muslims face state-sanctioned persecution. Tens of millions are in gulags, being used as slave labor to drive China's booming economy. Mr. Hu staunchly supports Beijing's genocidal one-child policy, which has led to millions of forced abortions and has coerced countless women to be sterilized against their will. He is not a progressive visionary; rather, he is a butcher. This is the man Mr. Obama toasts - and to whom he bows.
Orbiting Earth at 16,500 mph, the Chinese station flitted across the sun in only 0.9s," says Legault, who captured the split-second transit using a solar-filtered Takahashi FSQ-106 refractor and a Canon 5D Mark II digital camera.
At the moment, the silhouette of the 19,000 pound Tiangong-1 is dwarfed by its older cousin, the 990,000 pound ISS. Tiangong-1 will grow a little larger in the summer of 2012 when the Shenzhou 9 spacecraft docks with it. Three Chinese astronauts will be on board for their first visit to the outpost. The Chinese space agency says this is just the first step toward the development of a much larger space station planned for launch in 2020. Stay tuned for more--and bigger--silhouettes.
You can see Tiangong-1 with the naked eye shining in the night sky as brightly as the stars of the Big Dipper. Check your smartphone or SpaceWeather's Simple Satellite Tracker for sighting opportunities.
The Chinese space station (CSS) is a planned artificial satellite to be placed in low earth orbit. Built and launched entirely by the People's Republic of China (PRC), it shall combine indigenous designs with international compatibility. It is part of Project 921 of the Chinese space program. It is a third generation modular space station, comparable to the Soviet/Russian Mir, Russian OPSEK and the ISS. Operations will be controlled from the Beijing Aerospace Command and Control Centre in the People's Republic of China. The public is being invited to help name the project, which will enhance China's national prestige, and strengthen the sense of cohesion and pride.
Planned launching date is "around 2020" according to Zhang Hailian of the China Manned Space Engineering Office.
Wang Wenbao, director of the Chinese space agency (CSME), believes that the project "[W]ill enhance national prestige and strengthen the national sense of cohesion and pride." Jiang Guohua says, "We will adhere to the policy of opening up to the outside world". "Scientists of all countries are welcome to participate in space science experimental research on China's space station." Guohua is an engineer at the China Astronaut Research and Training Centre.
The CSS will improve researchers ability to conduct science experiments in freefall (Zero-gravity) and the space environment, beyond the duration offered by China's unmanned artificial satellites and man-tended modules. Individual experiments will not require their own orbital launchers, but can be sent to the station on robot spacecraft, and be conducted by long-term crews.
Experience gained in the operation of the station and in human health research can be applied to interplanetary and deep-space missions.
After the United States threatened to use nuclear weapons during the Korean War, Chairman Mao Zedong decided that only a nuclear deterrent of its own would guarantee the security of the newly founded PRC. Thus, Mao announced his decision to develop China's own strategic weapons, including associated missiles. After the launch of mankind's first artificial satellite, Sputnik 1 by the Soviet Union on 4 October 1957, Chairman Mao decided to put China on an equal footing with the superpowers (“我们也要搞人造卫星”), using Project 581 with the idea of putting a satellite in orbit by 1959 to celebrate the 10th anniversary of the PRC's founding.
Mao and Zhou Enlai decided on 14 July 1967 to begin the PRCs crewed space program. China's first manned spacecraft design was named Shuguang-1 (曙光一号) in January 1968. Project 714 was officially adopted in April 1971 with the goal of sending two astronauts into space by 1973 aboard the Shuguang spacecraft. The first screening process for astronauts had already ended on 15 March 1971, with 19 astronauts chosen. The program was soon cancelled due to political turmoil.
The next crewed space program was even more ambitious and was proposed in March 1986 as Project 863. This consisted of a crewed spacecraft (Project 863-204) used to ferry astronaut crews to a space station (Project 863-205). Several spaceplane designs were rejected two years later and a simpler space capsule was chosen instead. Although the project did not achieve its goals, it would ultimately become the 1992 Project 921 project, encompassing the Shenzhou program, the Tiangong program, and the CSS.
On the 50th anniversary of the PRC's founding, China launched the Shenzhou 1 spacecraft on 20 November 1999 and recovering it after a flight of 21 hours. The country became the third country with a successful crewed space program by sending Yang Liwei into space aboard Shenzhou 5 on October 15, 2003 for more than 21 hours.
Originally, China planned to simply dock Shenzhou 8 and Shenzhou 9 together to form a simple space laboratory. However, it was decided to abandon that plan and launch a small space laboratory instead. In 2007, plans for a "space laboratory", Tiangong 1 were announced. Subsequent flights (Shenzhou 9 and Shenzhou 10) would dock with the laboratory. Tiangong 1 consisted of a propulsion module, and a pressurised module for experiments. The Chinese space agency incorrectly stated that Tiangong 1 had a docking port at both ends. The docking port of the experiment section supported automated docking. Launched on September 29, 2011, it was intended for short stays of a crew of three. The second docking port, on the propulsion module, was kept screened from press photography inside and outside the module.
The Chinese Space Lab will be launched in 2013, for a crew of three and with twenty days of life support.
The Chinese Space Lab is expected to be launched around 2015, with 40 days of life support for a crew of three. It shall be used to evaluate regenerative life-support technology, and verify orbital replenishment of propellant and air, similar in function to the Russian Elektron system used on Mir and the ISS.
The paramount leader of the People's Republic of China from 1978 to 1992 Deng Xiaoping changed the cultural fabric of the Chinese society and decided names used in the space program, previously all chosen from the revolutionary history of the PRC, would be replaced with mystical-religious ones. Thus, new Long March carrier rockets were renamed Divine arrow (神箭), spacecapsule Divine vessel (神舟), space shuttle Divine dragon (神龙), land-based high-power laser Divine light (神光) and supercomputer Divine might (神威).
These poetic names continue as the first, second, third, fourth and fifth Chinese Lunar probes are called Chang'e after the moon goddess. The name "Tiangong" means "heavenly palace". Across the PRC the launch of Tiangong 1 inspired a variety of feelings, including love poetry. Within the PRC, the rendezvous of space vehicles is compared to the dreaming of the the cowherd and the weavergirl, Niulang Chinese: 牛郎 and Zhinü Chinese: 織女, lovers separated by the milky way which was scratched there by an angry godess. Only on the night of sevens, over a bridge made from all of the sympathetic magpies in the world, the lovers may meet. The remainder of the year, Zhinü sits on the banks of the 'milky way' river with two her children and weaves the clouds, with Niulang on the other side.
Wang Wenbao, director of the CMSE, told a news conference in 2011 "Considering past achievements and the bright future, we feel the manned space programme should have a more vivid symbol, and that the future space station should carry a resounding and encouraging name. We now feel that the public should be involved in the names and symbols, as this major project will enhance national prestige and strengthen the national sense of cohesion and pride." Imagery of the Chinese space program has been used by the Party (government) to strengthen it's position and promote patriotism since the late 1950's and early 1960's.
The CSS is a third generation modular space station. First generation space stations, such as early Salyut (fireworks) and Almaz (diamond) stations and Skylab were single piece stations, and not designed for resupply. Salyut 6, 7 and Tiangong stations are designed for mid-mission resupply. Mir, the International Space Station, OPSEK and the CSS are modular space stations, assembled on-orbit from pieces launched separately. Modularised design methods can greatly improve reliability，reduce costs, shorten development cycle, and meet diversified task requirements.
The assembly method of the station can be compared with the Soviet-Russian Mir space station and the Russian orbital segment of the International space station, if the station is constructed, China will be the second nation to develop and use automatic rendezvous and docking for modular space station construction. Shenzhou spacecraft and space stations use a domestically made docking mechanism similar to, or compatible with, the Russian designed APAS docking adapter.
During the cordial Sino-Soviet relations of the 1950s, the USSR engaged in a cooperative technology transfer program with the PRC under which they taught Chinese students and provided the fledgling program with a sample R-2 rocket.
The first Chinese missile was built in 1958 reverse-engineered from the Soviet R-2, itself an upgraded version of the German V-2 rocket.  But when Soviet premier Nikita Khrushchev was denounced as revisionist by Mao, the friendly relationship between the two countries turned to confrontation. As a consequence, all Soviet technological assistance was abruptly withdrawn after the 1960 Sino-Soviet split.
Development of the Long March rocket series allowed the PRC to initiate a commercial launch program in 1985, which has since launched over 30 foreign satellites, primarily for European and Asian interests.
In 1994, Russia sold some of its advanced aviation and space technology to the Chinese. In 1995 a deal was signed between the two countries for the transfer of Russian Soyuz spacecraft technology to China. Included in the agreement was training, provision of Soyuz capsules, life support systems, docking systems, and space suits. In 1996 two Chinese astronauts, Wu Jie and Li Qinglong, began training at the Yuri Gagarin Cosmonaut Training Centre in Russia. After training, these men returned to China and proceeded to train other Chinese astronauts at sites near Beijing and Jiuquan. The hardware and information sold by the Russians led to modifications of the original Phase One spacecraft, eventually called Shenzhou, which loosely translated means “divine vessel.” New launch facilities were built at the Jiuquan launch site in Inner Mongolia, and in the spring of 1998 a mock-up of the Long March 2F launch vehicle with Shenzhou spacecraft was rolled out for integration and facility tests. 
A representative of the Chinese manned space program stated that around the year 2000, China and Russia were engaged in technological exchanges regarding the development of a docking mechanism. Deputy Chief Designer, Huang Weifen, stated that near the end of 2009, the Chinese agency began to train astronauts on how to dock spacecraft.
The Core Cabin Module provides life support and living quarters for three crew members, and provides guidance, navigation, and orientation control for the station. The module also provides the station’s power, propulsion, and life support systems. The module consists of three sections, living quarters, service section and a docking hub.
The living quarters will contain a kitchen and toilet, fire control equipment, atmospheric processing and control equipment, computers, scientific apparatus, communications equipment to see and hear ground control in Beijing, and other equipment.
The first of two Laboratory Cabin Modules will provide additional navigation avionics, propulsion and orientation control as backup functions for the CCM. Both LCMs provide a pressurised environment for researchers to conduct science experiments in freefall or Zero-gravity which could not be conducted on Earth for more than a few minutes. Experiments can also be placed on the outside of the modules, for exposure to the space environment, cosmic rays, vacuum, and solar winds.
Like Mir and the Russian orbital segment of the ISS, the CSS modules will assemble themselves in orbit, in contrast to the US Orbital Segment of the ISS, which required spacewalking to interconnect cables, piping, and structural elements manually. The axial port of the LCMs will be fitted with rendezvous equipment and will first dock to the axial port of the CCM. A mechanical arm similar to the Russian Lyappa arm used on the Mir space station will then move the module to a radial port of the CCM.
Electrical power is provided by two steerable solar power arrays on each module, which use photovoltaic cells to convert sunlight into electricity. Energy is stored to power the station when it pass into the Earths shadow. Resupply ships will replenish fuel for the stations propulsion engines for station keeping, to counter the effects of atmospheric drag.
Foreign sources have stated that the docking mechanism strongly resembles APAS-89/APAS-95, with one American source going as far as to call it a clone. There have been contradicting claims on the compatibility of the Chinese system with both current and future docking mechanisms on the ISS.
The station will be resupplied by manned spacecraft and robot cargo ships.
is designed primarily to carry crew into orbit, it consists of three modules, a forward orbital module (轨道舱), used by crew as working and living space, a reentry module (返回舱) in the middle, which removes all unnecessary equipment making the simplest and thereby safest return to earth, and an aft service module (推进舱), which contains engines, propellants, guidance and orientation control, and cooling. Anything placed in the orbital or service modules does not require heat shielding, and this increases the space available in the spacecraft without increasing weight as much as it would if those modules were also able to withstand reentry. Thus both Soyuz and Shenzhou have more living area with less weight than the Apollo CSM. The mass of the ship is around 8,000 kg, it is 9.25 m long, and the maximum diameter of the modules is 2.80 m, with solar panels extended, it's 17.00 m across.
Until Shenzhou 8, the orbital module of the Shenzhou was equipped with its own propulsion, solar power, and control systems, allowing autonomous flight. It was possible for Shenzhou to leave an orbital module in orbit for redocking with a later spacecraft, something which the Soyuz cannot do since the only hatch between orbital and reentry modules is a part of reentry module, and orbital module is depressurised after separation. In the future it is possible that the orbital module(s) could also be left behind on station as additional station modules. Small modules for the ISS are launched by Soyuz spacecraft in this way. In unmanned test flights the orbital module of each Shenzhou was left functioning on orbit for several days after the reentry modules return, and the Shenzhou 5 orbital module continued to operate for six months after launch.
Modified versions of Tiangong spacecraft will be used as robotic cargo spacecraft to resupply this station. The launch mass of the Tiangong-1-derived cargo spacecraft is expected to be around 13,000 kg with a payload of around 6,000 kg. Launch, rendezvous and docking shall be fully autonomous, with mission control and crew used in override or monitoring roles. This system becomes very reliable with standardisations that provide significant cost benefits in repetitive routine operations. An automated approach could allow assembly of modules orbiting other worlds prior to manned missions.
The CSS will be operated in Low Earth Orbit, 340 to 450 kilometers above the Earth at an orbital inclination of 42 to 43 degrees, in the centre of the Earths Thermosphere. At this altitude there is a variety of space debris, consisting of many different objects including entire spent rocket stages, dead satellites, explosion fragments—including materials from anti-satellite weapon tests, paint flakes, slag from solid rocket motors, coolant released by RORSAT nuclear powered satellites and some of the 750,000,000  small needles from the American military Project West Ford. These objects, in addition to natural micrometeoroids, are a significant threat. Large objects could destroy the station, but are less of a threat as their orbits can be predicted. Objects too small to be detected by optical and radar instruments, from approximately 1 cm down to microscopic size, number in the trillions. Despite their small size, some of these objects are still a threat because of their kinetic energy and direction in relation to the station. Spacesuits of spacewalking crew could puncture, causing exposure to vacuum.
Space debris objects are tracked remotely from the ground, and the station crew can be notified. This allows for a Debris Avoidance Manoeuvre (DAM) to be conducted, which uses thrusters on station to change orbital velocity and altitude, avoiding the debris. DAMs will take place if computational models show the debris will approach within a certain threat distance. Usually the orbit will be raised saving fuel, as the stations orbit must be boosted periodically to counter the effects of atmospheric drag. If a threat from orbital debris is identified too late for a DAM to be safely conducted, the station crew close all the hatches aboard the station and retreat into their Shenzhou spacecraft, so that they would be able to evacuate in the event it was damaged by the debris. Micrometeorite shielding is incorporated into the station to protect pressurised sections and critical systems. The type and thickness of these panels varies depending upon their predicted exposure to damage.
Stations in low earth orbit are partially protected from the space environment by the Earth's magnetic field. From an average distance of about 70,000 km, depending on Solar activity, the magnetosphere begins to deflect solar wind around the Earth and space stations in orbit. However, solar flares are still a hazard to the crew, who may receive only a few minutes warning. The crew of the ISS took shelter as a precaution in 2005 in a more heavily shielded part of that station designed for this purpose during the initial 'proton storm' of an X-3 class solar flare, but without the limited protection of the Earth's magnetosphere, China's planned manned mission to Mars is especially at risk.
Subatomic charged particles, primarily protons from cosmic rays and solar wind, are normally absorbed by the earths atmosphere, when they interact in sufficient quantity their effect becomes visible to the naked eye in a phenomena called an Aurora. Without the protection of the Earth's atmosphere, which absorbs this radiation, station crews are exposed to about 1 millisievert each day, which is about the same as someone would get in a year on Earth, from natural sources. This results in a higher risk of crew members developing cancer. Radiation can penetrate living tissue and damage DNA, cause damage to the chromosomes of lymphocytes. These cells are central to the immune system and so any damage to them could contribute to the lowered immunity experienced by crew. Radiation has also been linked to a higher incidence of cataracts in astronauts. Protective shielding and protective drugs may lower the risks to an acceptable level.
The radiation levels experienced on ISS are about 5 times greater than those experienced by airline passengers and crew. The Earth's electromagnetic field provides almost the same level of protection against solar and other radiation in low Earth orbit as in the stratosphere. Airline passengers, however, experience this level of radiation for no more than 15 hours for the longest intercontinental flights. For example, on a 12 hour flight an airline passenger would experience 0.1 millisievert of radiation, or a rate of 0.2 millisieverts per day; only 1/5 the rate experienced by an astronaut in LEO.
China, Russia and Europe work together towards manned deep space exploration, space stations allow the development of technology required for these missions. The psychosocial experiment Mars 500 provides the ground-based studies to complement orbital research in preparation for a planned manned mission to the planet Mars. Yinghuo-1, a Chinese Mars-exploration space probe, intended to be the first Chinese spacecraft to explore Mars, was launched from Baikonur Cosmodrome, Kazakhstan, on 8 November 2011, along with the Russian Fobos-Grunt sample return spacecraft, which was intended to visit Mars' moon Phobos. Shortly after launch, Fobos-Grunt was expected to perform two burns to depart Earth orbit bound for Mars. However, these burns did not take place, leaving the probe stranded in orbit. On 17 November 2011, Chinese state media reported that the probe had been declared lost by the CNSA. Anatoly Perminov, head of the Russian Federal Space Agency, revealed in September 2006 in RIA Novosti that Russia and China were working on lunar exploration as partners, and that the Russian-Chinese Space Sub-Commission's priority was to conclude a joint lunar exploration agreement by the end of that year. The first Chinese Lunar Exploration Program un-crewed lunar orbiter Chang'e 1 was successfully launched on October 24, 2007, making China the fifth nation to successfully orbit the Moon.
Cooperation in the field of manned space flight between the CMSEO and the Italian Space Agency was examined in 2011, participation in the development of China manned space stations and cooperation with China in the fields such as astronauts flight, and scientific research was discussed.  Potential areas and ways for future cooperation in the fields of development of manned space station, space medicine and space science have also been discussed during the meeting.
The station has a service life of ten years. Chinese manned spacecraft use deorbital burns to slow their velocity, resulting in their re-entry to the earths atmosphere. Vehicles carrying a crew have a heat shield which prevents the vehicles destruction caused by friction with the Earths atmosphere. The CSS has no heat-shield, however small parts of space stations reach the surface of the Earth, so uninhabited areas are targeted by de-orbit manoeuvres.