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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
Firstly, security alarms lighting is a lot less costly than other styles of enhanced security. Bars on windows, security screen doors, security systems, and camera systems are costlier. Just one pair of security bars for one window will cost you a minimum of 30 dollars. Multiply this number by how many windows the average house has, and you'll see how this can get expensive in a short time.
Cars and motorcycles differ on wheels and over all physics. They move, stop and turn differently. A motorcycle can cover a smaller space while a vehicle covers a big space. Since a motor vehicle is larger, it can carry lots more people, can waste more resources and will isolate the driver from the environment. This isolation is a very common method to obtain road accident. A person in the car is less mindful of his surrounding thus it allows anybody to use his cellular phone while driving, read or eat resulting to more accidents as a result of distracted driving.
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