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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
The fully redesigned 2013 Honda Accord returns to the top level of the family-sedan class with a number of new specifications. Apart from a roomy and high-quality interior, the car's styling is visibly less bulky. Besides, Honda adds power- and efficiency-enhancing direct-injection technology for the Accord's standard 2.4-liter four-cylinder engine. With this four-cylinder, performance is markedly improved. What's more, each car also includes antilock disc brakes, active front head restraints, stability and traction control, front seat side airbags and side curtain airbags.
Secondly, in case you are really gonna try to repair that scratched DVD then there is nothing strange, technical or mystical regarding the process. DVDs, CDs and Game Discs are made from a hard clear plastic called polycarbonate. The repair of scratched DVDs is nothing greater than a workout in polishing or re-surfacing an item of polycarbonate plastic. So in the event you are feeling somewhat nervous about attempting it. . . relax!
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