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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
Many people prefer cars over motorcycles. But a lot of people also prefer a motorcycle more than a car. You may prefer to ride a bicycle because you tend to be comfortable on it than inside a car, but other like to drive a vehicle than ride since they feel secure being incased with a metal. There are many differences between a car and a motorcycle and are also our personal preferences. There is a constant debate of what is better on the list of two.
Enzo ferrari, the founder of ferrari, said: "his favourite car is the one he hasn't built yet, and his greatest success has been his unachieved success." The Italian, known as the "father of racing cars", has been bubbling with a voracious blood. When he was 13, he finally convinced his father to start his own history of driving alone. The roar of the engine on the racetrack, the thrill of the game and the thrill of the game made him more than brave. He drove Alfa Romeo, winning, winning and being hailed as a "cavalier" by his teammates. He went to the race car to build a racing club and eventually started his own car company. Ferrari is known as the red devil.
Wheldon won the complete IndyCar series championship when he was named the winner with the 2005 Indianapolis 500. He also won Indianapolis 500 in May of the year. This time, it turned out announced that any non-regular IndyCar drivers who won the race could be offered a $5million bonus. Mr Wheldon is at line for this bonanza, pushing him they are driving faster than normal.
Generators have generally two basic parts named "Stator" and "Rotor". Mechanical energy is provided to the rotor of a generaotor by means of a prime mover (i.e. a turbine). Turbines are of different types like steam turbine, water turbine, wind turbine etc. Mechanical energy can also be provided by IC engines or similar other sources.
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