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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
Dressed in the smart attire to the evening, Tom Daley chosen a brilliant jacket worn more than a white t-shirt which has a blue-coloured pocket. The Olympic driver teamed his outfit using a set of two black trousers and shoes. Meanwhile, his boyfriend Dustin Lance Black looked equally smart in the grey t-shirt and black leather jacket. The 39-year-old American screenwriter, who recently moved London to spend added time together with his lover Tom Daley, completed his appearance with a pair of stylish blue jeans.
Have you ever imagined that after that become your reaction, in case your device gets have been infected with harmful threats because you've missed an import update? If no then you could be installing important updates by the due date. Installing security updates are one of the most critical chapters of PC maintenance also it uses a great deal of attention for doing so. So, when you have iOS and OS X devices, it's recommended to install every one of the latest updates when they're presented through the manufacturer. Security updates add a supplementary layer of security to your devices and network so that you need to make sure which you have not missed out any.
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