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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],'brighthub_com-medrectangle-4','ezslot_0']));This isn't {just a|only a|merely a|simply a} gaming keyboard; {if you want a|if you prefer a|if you need a|should you prefer a} {high quality|top quality|good quality|excellent} keyboard for business reasons, the 7G {will look|will appear|can look|will be} the part {in a|inside a|in the|in a very} well decorated office {more than a|greater than a|higher than a|greater} ho-hum keyboard. Don't spend thousands {on a|on the|over a|with a} desk to impress clients and cheap out {when it comes to|with regards to|in terms of|in relation to} {the keyboard|the laptop keyboard|laptop keyboards} that sits {on it|onto it|about it|into it}. The solid look {of this|of the|with this|on this} thing {gives the|provides the|provides|increases the} impression {that you are|that you're|that you will be|you are} {ready to|prepared to|able to|willing to} {work through|sort out|process|function with} an earthquake or military coup.|The Red Baron airplanes {made by|produced by|created by|manufactured by} Albatros evolved steadily throughout World War I. The first plane flown by Richthofen was an Albatross C.III, a two-seat general use biplane {that was|which was|that has been|that's} eventually {produced in|manufactured in|created in|stated in} larger numbers than any C series Albatros. It was {used for|employed for|useful for|used by} photo-reconnaissance, bomber escort, {and light|and lightweight|and light-weight} bombing, {and is|and it is|and is also|which is} the plane that Richthofen trained {as a|like a|being a|as being a} pilot in.|eval(ez_write_tag([[300,250],'brighthubpm_com-medrectangle-"That's correct," the shepherd replied.The {young man|child|son|kid} {picked up|acquired|found|grabbed} {the biggest|the largest|the greatest|the most important} animal he could lay his {hands on|on the job|practical|face to face}, {but before|before|when|to start with} he could drive away, the shepherd said, 'If I can tell you {exactly what|precisely what|just what|what exactly} {your business is|your company is|your enterprise is|your small business is}, {will you|are you going to|do you want to|would you like to} {give me|produce|supply|deliver} back my goat?" 'Sure," replied the {young man|child|son|kid}. 'You {are a|really are a|certainly are a|can be a} Six Sigma Black Belt," said the shepherd. 'That's correct," said the amazed {young man|child|son|kid}. 'How {did you|have you|do you} {guess that|reckon that|estimate that}?" He asked, curiously.|var ezzns21 = Young Diesel graduated {at the top of|towards the top of|near the top of|on top of} his class in 1873 and {enrolled in|signed up for|participating in|going to} the Industrial School of Augsburg. Two years later he enrolled {at the|in the|on the|with the} Royal Bavarian Polytechnic in Munich. He would have graduated in July 1879, but he was sick with typhoid fever. He graduated in January 1880 and moved {back to|to|returning to|time for} Paris. There, he {went to work|began|started} for his former professor Carl von Linde {in the|within the|inside the|inside} {design and construction|construction and designs|construction and design} {of a|of the|of your|of an} refrigeration and ice plant.|Algae {are a|really are a|certainly are a|can be a} broad {group of|number of|band of|gang of} simple plants {ranging from|which range from|including|starting from} single-celled diatoms to fifty meter long giant kelp. There are over 100,000 species. Some algae form symbiotic relationships {with other|along with other|with|to} organisms {to build|to construct|to create|to develop} lichens and coral reefs. Among the oldest organisms on Earth, algae {found in the|based in the|perfectly located at the|located in the} Vindhya Basin of India {date back|go as far back|go back} over 1.5 billion years.|What {is the|may be the|will be the|could be the} {most expensive|priciest|most costly|most high-priced} car to insure? According to Insure.com's 2010 annual survey of {car insurance|auto insurance|motor insurance|automobile insurance} costs, the {most expensive|priciest|most costly|most high-priced} car to insure {is the|may be the|will be the|could be the} Porsche 911 Carrera GT2, a 2-door coupe costing {on average|normally|typically|an average of} about $2900 {per year|each year|annually|a year} to insure. The car itself {has a|includes a|features a|carries a} {sticker price|car or truck|automobile} {of about|around|of approximately|of around} $195,000. Apart from the {fact that|proven fact that|undeniable fact that|idea that} the Porsche {is expensive|is pricey|is costly}, {it is a|it's a|this is a|it is just a} small fast car {with a|having a|using a|which has a} high horsepower of 530. Four {of the|from the|with the|in the} 10 {most expensive|priciest|most costly|most high-priced} cars to insure {in 2010|this year|this season|really} {are in fact|are actually|are in reality|have been} Porsche models and three are Mercedes models. See the figure below {for a|for any|to get a|for the} table {of the|from the|with the|in the} 10 {most expensive|priciest|most costly|most high-priced} 2010 model cars to insure. You can {click on the|click the|go through the} image {to see|to determine|to find out|to view} an enlarged version. |The team meets John Thornton on the way to their destination, {and he|and that he|and the man|anf the husband} warns them {not to|to not|never to|to never} {move forward|move ahead|progress|advance}, {as the|because the|since the|because} ice ahead {is very|is extremely|is quite|is incredibly} thin. Hal ignores his advance and orders {the team|they|the c's} to proceed. Buck, however, feels that something is wrong ahead, {and he|and that he|and the man|anf the husband} refuses. Hal beats Buck, and Thornton saves him. The rest of {the team|they|the c's} moves ahead {and is|and it is|and is also|which is} swallowed {when the|once the|if the|in the event the} ice breaks beneath them.}
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