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Spacecraft flew hundreds of thousands to hundreds of millions of kilometers from the earth, injecting speed when the size and direction of a slight error, arrived at target planets will appear large deviation error, for example, when Mars probe injecting speed 1 m/s speed (about one over ten thousand), arrived at Mars, about 100000 km distance deviation. Therefore, precise control and navigation must be carried out during the long flight. Flying to the moon is usually controlled by the orbital control system of the ground and space probe (see orbit control). Interplanetary flight distances, radio signal transmission time is long, the real-time remote control, can't so planets and interplanetary spacecraft orbit control system shall have the ability of autonomous navigation (see interstellar travel navigation and control). The United States, for example, "pirates" spacecraft in space flight of more than eight hundred million km, for 11 months of 2000 times of autonomous orbit adjustment, the final surface to achieve a soft landing on Mars, placement accuracy up to 50 km. In addition, in order to ensure the accuracy of the orbit control engine, the communication antenna is always aimed at the earth, and other systems work normally, and the detector has the autonomous attitude control ability During our childhood, we've read a good deal about flying chariots in may divine stories. Though we would not believe it, we now see people traveling by airplanes. Traveling is now so simple nowadays. The automobile industry has also undergone a great deal of changes because the invention of steam engine vehicle. How many of you know that the Benz patent motor car of 1885 would have been a motorized tricycle? Today find an incredible number of automobiles on the highway, in several models, shapes, sizes, colors, and prices. Some of typical family fridge problems might be predetermined yourself, you have to start using a qualified to handle complex restoration perform. Even though the fridge may start looking span and spic externally, it does not necessarily mean that the device is performing efficiently through the in. Incessant requests around the repairman and several concerned times adhere to, till you ultimately buy it fixed going back to its standard express. Did you realize there are specific methods for you to definitely keep the family fridge operating smoothly? One can find in fact some strategies to repair the apparatus yourself, without depending on your normal assistance.

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