|
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
First thing that you need to take into account will be the quality of the music box – when it is functional or will it require music box repair expert to fix broken parts. You must understand that music box can be a delicate device that will be easily damaged or cracked, but commonly could be repaired too.
Review: Androstenone is really a sexual hormone that is certainly now being marketed to help you men attract the fairer sex. Advertisements for your oil based cologne claim that men wearing Androstenone are able to have more women than these that do not. The product may be dabbed on and has a shelf life of at least 4 hours though some men report the scent lasting for 8 or more hours.
New Car Buying Tips--
wappingers mercedes
future mercedes benz
mercedes s class audio system
1978 mercedes 280ce
mercedes b200 2006
Copyright ?1998-2017 Technews Corp, All rights reserved
|
