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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 fourth reason is that people don't learn how to be happy with their present life and they're too crazy for comparing their lives with others'. When they have a small house, they are going to envy others' huge home; when they have work, they're thirst for the better one as well as in this situation they always think that what others have is the foremost. Such being the situation, they won't have a very balanced mood towards life.
For instance, Khojle provide a very exclusive offer for Used Maruti Car in Hyderabad. One can easily purchase the used Maruti Swift LDI Cars in Hyderabad. 2009 Model Silky Silver colored used Maruti Swift LDI car in good shape which has a meter reading of 30000 can be obtained on the market at a price of Rs 395000. The car is well maintained and is also single hand driven. The car comes with a number of features and accessories including Power steering, Power windows, AC, Music system, centralized locking system etc. Almost every add from Khojle hold the info in the dealer. To purchase the above used Maruti Swift, you are able to contact to 9000008471.
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