Shenzhou V, due to become China's first manned spaceship when it
is launched this autumn, will be fitted with an alarm system to
avoid collisions in space, it was announced at the second National
Space Debris Workshop held in Shanghai at the weekend.
The alarm system will keep the spacecraft away from the orbit of
space debris by automatically changing its propulsion and speed,
said Professor Du Heng, chief scientist at the Center for Space
Science and Applied Research under the Chinese Academy of
Sciences.
To ensure the smooth launch and return of Shenzhou V, the center
is keeping a close watch over the 9,131 trackable pieces of space
debris to screen those that are most likely to get in the way of
the spaceship. They are making calculations to a high degree of
accuracy and then putting forward suggestions as to how to avoid
collisions.
Space experts at the weekend's workshop said an exact launch
date has not yet been decided because so many factors are involved,
such as the activities of the sun, the temperature, radiation, and
the situation in the ionosphere .
Space debris means artificial objects or fragments cast off in
the space, whether deliberately or unintentionally. With the
development of the space industry, the amount of debris has been
increasing and now poses a potential danger to spaceships,
especially manned craft.
Since the former Soviet Union sent the first craft into space in
1957, over 26,000 objects have been sent into space by
humankind.
Now there are 9,131 trackable pieces of debris in space,
together with many smaller pieces, moving at great speed.
Li Benzhen -- an official with the Commission of Science,
Technology and Industry for National Defence -- said: "The research
into space debris that might fatally destroy manned spacecraft is
greatly significant to China, even though it did not start until
2000 and is very much behind that in the United States and other
countries.''
The commission has over 30 million yuan (US$3.63 million) in
funding for the period between 2000 and 2005 to research how to
minimize the effects of space debris and develop protection against
it . It is working to improve observation methods, enhance studies
into space debris environments and set up a data bank to help
China's space exploration.
Li said China has put into operation an optical telescope with a
diameter of 25 centimeters and will "soon'' launch one with a
diameter of 65 centimeters.
The largest optical telescope in the United States has a
diameter of 3.64 meters. China will continue to invest more in
research into space debris to reach the international level, said
Dong Yang, a deputy division director at the Ministry of
Finance.
(China Daily August 11, 2003)