Don't be afraid of, the trash will not pound on

Don't be afraid of, the trash will not pound on the head!

Achieve the intention (the materials photo) around the trash computer on the earth
"It may be that some recent reports let the public produce the somewhat fear, fear the space chip will threaten people's existence. In fact the public can rest assured, the space chip will not pound on everybody's head, such probability is too small. " Chinese Academy of Sciences national Deputy Director of space science centre Gong build the village and say with a smile, the space chip are common said " The trash " ,They will hardly threaten the mankind, the reason why the scientists study them, because the space chip are formidable enemies of the spacecraft.

How much rubbish is there in the space?

Since the first satellite flew to the sky in 1957, the quantity of the space chip is increased progressively year by year, Gong build village, introduce according to data that U.S.A. announce, up to this week, spot diameter, probably there are more than 16,000 slices of in 10 space chip of the above. "Chip these distribute in different orbit, from the intersection of the earth and kilometer of low orbits, hitting orbiting, high orbiting beyond the odd ten thousand kilometers,etc. beyond the thousands of. So as to density, it is not very high. "

How were the space chip produced? According to specializing in the international organization of the space chip " The space chip Coordination Committee among the organizations " Definition,space be meant chip "in orbit or not return to by not function objects artificialing of atmosphere, including its incomplete piece and assembly " ,Include spacecraft, the intersection of carrier rocket and the intersection of arrow and body, operational chip that abandon, explode, disintegrate piece,etc..

Will the trash hurt one's feeling?

Generally speaking, the space chip are divided into three kinds: Large space chip, point the space piece of more than over 10 centimetres of diameter; Small space chip, mean the space chip of the diameter under 1 millimetre; Dangerous chip, mean lying between chip of the large, small space chip. "But this is big and and small, dangerous or not, it is for spacecraft, it is not for mankind. " Chinese Academy of Sciences national researcher, centre of space science, henry explain, once spacecraft hit and be destroyed the intersection of diameter and 10 space chip of the above completely, the reason why let " The dangerous chip " ,Because the mankind, to its effective survey method, and the quantity is enormous, it is more difficult to protect. The spacecraft returns to the earth each time, the ones that will nearly all be found and struck on the surface by the space chip are rugged.

Even the large space chip, will not threaten the mankind either. "If they fall the earth, enter atmosphere, high-speed friction will produce thousands of degrees of high temperature, have been basically burnt clean. " Henry shows too, this does not represent we can adopt a casual attitude: "If has not burnt the clean fragment to the ocean or desolate and uninhabited desert, hardly constitute a threat to. But if leave the populous city, that consequence is too ghastly to contemplate. And larger risk lies in, the space chip may threaten the ecosystem of ground, bring chemistry and radioactive pollution to environment. "

What if encountering the trash?

To that " the invalid satellite will break entirely " This question, Gong builds the village to think, this kind of possibility is very small. "May know and fall after the satellite that the low orbit runs fails; In in, last satellite orbits high,can't even not fail, centuries will drop by the earth even to decades. " Gong builds the village and says, " as above-mentioned just like we, once invalid satellite enters atmosphere, the high temperature produced in high-speed friction, will let them disintegrate. "

Even larger space chip have penetrated the protection of the atmosphere, threaten the earth, mankind's capable defence too. "First of all, we can be by estimating roughly out the orbit of them. " The intersection of Chinese Academy of Sciences and national researcher of space science centre four Liu clear to explain, the invalid satellite is influenced by factors such as atmospheric resistance,etc., " in the sports of a circle of circle one, its height is reducing constantly too, is close to the earth more and more. We can calculate their orbit roughly. " Liu four Qing says: "Certainly, because lead to the fact the factor that the orbit changes is numerous, predict to the space that it is very difficult to reach accurately. We have trained one to specially predict the team predicted, I believe with the constant accumulation of the experience, predict that predicts it will be more and more accurate too. "

Predict that predicts, and then the interception. Gong builds the village and introduces, once there was successful experience of intercepting the invalid satellite with the guided missile in U.S.A.. "That invalid satellite had drama poisonous substance quality at that time, in order to prevent it from crashing into the earth, U.S.A. launched the guided missile by the gunship on the sea to destroy this satellite. " Gong builds the village and says, " our country has similar technology too, can well be before the invalid satellite causes danger, let it disintegrate in the sky. "

If the sky " The star suffers from fully "

The satellites all play a more and more important role in the fields of economy, national defence, people's livelihood etc., in foreseeable future, the mankind will launch more satellites and other space facilities. " the star suffers from the sky fully " What is to be done?

Henry says, it is higher, with more difficult technology to retrieve the cost than to launch an artificial satellite of satellites, it is still very difficult to accomplish at present. In order to let the new satellite lift off safely, the scientists have thought of a lot of methods. "The countermeasure one is just strengthened and monitored, avoid the collision of the space chip; The second countermeasure is to do a good job of the shelter of spacecraft, improves ' immunity ' in the design, for example give spacecraft ' wear helmet wear first ', increase the intersection of spacecraft and the intersection of surface and the intersection of material and thickness, place in reasonable position,etc. by key part that collide. "

The scientists have also thought out a lot of methods to remove space piece. "For example some satellites leave some fuel appropriately, controls it to leave the original orbit before failing; And some countries research and develop passive technology, for example launch a spacecraft and catch and take chip away; Research and develop the satellite with mechanical arm, not only can maintain satellites, can also push the invalid satellite off the orbit. " Gong builds the village and says: "But still very ripe technology the, when can it comes into operation to be but also an unknown number on earth. "

(news from Beijing on September 27 staff reporter Qi Fang)


Don't be afraid of, the trash will not pound on the head!