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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
eval(ez_write_tag([[300,250],'brighthubpm_com-medrectangle-4','ezslot_0']));"That's correct," the shepherd replied.The young man picked up the largest animal he could lay his face to face, but before he could drive away, the shepherd said, 'If I can tell you just what your enterprise is, will you supply back my goat?" 'Sure," replied the young man. 'You are a Six Sigma Black Belt," said the shepherd. 'That's correct," said the amazed child. 'How did you estimate that?" He asked, curiously.
To own one of these vintages defines what you are, how we hang around and the way you wish to be known, and Cubans will go to incredible lengths to keep their classic cars running. 1950's bumpers and tailpipes are recreated and myriad the rest are adapted. Steering wheels carved from wood, hub cabs made from aluminum cans and plastic sheets for windows are typical. While such shortcuts could be frowned upon in the United States, classic car lovers admire the Cubans' ingenuity and their ability to maintain the cars running.
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On October 21, 1879, Edison's electric lighting experiment could be regarded as modern technology research
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