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WASHINGTON, May 11 (Xinhua) -- NASA's Dawn spacecraft has obtained its first image of the giant asteroid Vesta, which will help fine-tune navigation during its approach, the U.S. space agency announced Wednesday.Dawn expects to achieve orbit around Vesta on July 16, when the asteroid is about 117 million miles from Earth.The image from Dawn's framing cameras was taken on May 3 when the spacecraft began its approach and was approximately 752,000 miles (1.21 million km) from Vesta. The asteroid appears as a small, bright pearl against a background of stars. Vesta also is known as a protoplanet, because it is a large body that almost formed into a planet."After plying the seas of space for more than a billion miles, the Dawn team finally spotted its target," said Carol Raymond, Dawn's deputy principal investigator at NASA's Jet Propulsion Laboratory in Pasadena, California. "This first image hints of detailed portraits to come from Dawn's upcoming visit."Vesta is 330 miles (530 km) in diameter and the second most massive object in the asteroid belt. Ground- and space-based telescopes obtained images of the bright orb for about two centuries, but with little surface detail.Mission managers expect Vesta's gravity to capture Dawn in orbit on July 16. To enter orbit, Dawn must match the asteroid's path around the sun, which requires very precise knowledge of the body's location and speed. By analyzing where Vesta appears relative to stars in framing camera images, navigators will pin down its location and enable engineers to refine the spacecraft's trajectory.Dawn will start collecting science data in early August at an altitude of approximately 1,700 miles (2,700 km) above the asteroid's surface. As the spacecraft gets closer, it will snap multi-angle images allowing scientists to produce topographic maps. Dawn will later orbit at approximately 120 miles (200 km) to perform other measurements and obtain closer shots of parts of the surface. Dawn will remain in orbit around Vesta for one year. After another long cruise phase, Dawn will arrive in 2015 at its second destination, Ceres, an even more massive body in the asteroid belt.Gathering information about these two icons of the asteroid belt will help scientists unlock the secrets of our solar system's early history. The mission will compare and contrast the two giant asteroids shaped by different forces. Dawn's science instruments will measure surface composition, topography and texture. Dawn also will measure the tug of gravity from Vesta and Ceres to learn more about their internal structures. The spacecraft's full odyssey will take it on a 3-billion-mile (5-billion-km) journey, which began with its launch in September 2007.

LOS ANGELES, May 25 (Xinhua) -- NASA project managers bade farewell to the Mars rover Spirit on Wednesday after sending a final set of commands to the stranded vehicle.This marks the completion of one of the most successful missions of interplanetary exploration ever launched, NASA's Jet Propulsion Laboratory (JPL) said."Last night, just after midnight, the last recovery command was sent to Spirit," said John Callas, the Mars Exploration Rover Project manager at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, Los Angeles."It would be an understatement to say this was a significant moment. Since the last communication from Spirit on March 22, 2010, as she entered her fourth Martian winter, nothing has been heard from her."NASA has tried in vain to regain communication with Spirit since it got stuck in sand about two years ago. The rover last communicated on March 22, 2010, as Martian winter approached and the rover's solar-energy supply declined.NASA checked frequently in recent months for possible reawakening of Spirit as solar energy available to the rover increased during Martian spring, but to no avail.A series of additional re-contact attempts ended on Wednesday, designed for various possible combinations of recoverable conditions, according to JPL."Our job was to wear these rovers out exploring, to leave no unutilized capability on the surface of Mars, and for Spirit, we have done that," said Callas.

LOS ANGELES, May 20(Xinhua)-- Peter, a Chinese American who works for the post office in Rosemead, California, said he has been attacked by dogs twice in the past 10 years while delivering mails.He said as a mail carrier, he has to walk door to door to put mails into the mailboxes of the residents, and many times the owners were not at home but their dogs were too loyal to their duties and would see mail carriers like him as intruders."It is dangerous to be a mail carrier. The enemy is not humans but animals like dogs who have been generally seen as human's best friends," Peter, who asked not to identify his full name, told Xinhua.Mail carriers in the United States feel the real danger of being attacked by dogs while delivering mails door by door.Statistics released by the U.S. Post Office showed that 5,669 postal employees were attacked by dogs in 2010 in the United States. That's an average of 11 dog attacks every delivery day, and that figure does not include the number of threatening incidents that did not result in injury.Los Angeles is the third most dangerous city in the U.S. when it comes to being a mail carrier with 44 mail carriers being attacked by dogs in 2010, according to the U.S. Post Office.San Diego in California and Columbus in Ohio tied for second place, each logging 45 dog attacks. Houston in Texas is the most dangerous city in the U.S. for mail carriers with 62 attacks in 2010.On May 25, 2010, Eddie Lin, a 33-year old Chinese American postal carrier in San Diego, was attacked by a dog while delivering mail, his head hit on the ground and died 10 days later. His death angered his family and the whole community.The daughter of the dog's owner, who identified herself as Eva, said the incident has devastated her father."We feel really bad," Eva told the local press in an interview. "It's just killing my Dad," she added.On Sept. 30, 2010, a German Shepard and a Pitbull mix attacked Hu Ruiz, a 10-year veteran of the U.S. Postal Service. He luckily recovered from puncture wounds on his arms after the two dogs attacked him as he made deliveries along Camden Avenue in San Jose, California.It is not the problem for the mail carriers only. Dogs attack other people too. Statistics showed that there are more than 4.7 million Americans bitten by dogs nationwide annually.

BEIJING, Feb. 12 (Xinhua) -- China said late Saturday that members of the United Nations should work for a broadly-based consensus on the reform of the UN Security Council.Foreign Ministry spokesman Ma Zhaoxu made the remarks in response to a relevant question.Media reports had it that a recently-released declaration by some countries said most of UN member nations supported enlarging the council with new permanent and non-permanent members, and insisted tangible results be achieved in this regard during the Current Session of the UN General Assembly.Ma said China held that UN member nations should seek for a package of solutions for the reform, on the basis of broad and democratic consultation among member nations to accommodate interests and concerns of all parties.He said though some positive progress had been made since inter-government negotiations regarding the reform of the UN Security Council were launched, there were still serious differences within all parties over certain important issues about the reform.China advocated that the more differences the member countries had on the reform, the more necessary for UN member nations to enhance dialogue and consultation, he said."Experience has proven that presetting results for the reform or forcing premature reform plans will not only undermine the unity of UN member nations, but also harm the reform process, which will not be in line with any party's interests," he said.China is ready to maintain contact with all relevant parties, and make joint efforts with other member nations to push forward the reform in a way which can be conducive to safeguarding the overall interests of UN and the unity of the member nations, said Ma.

BEIJING, Feb. 12 (Xinhua) -- Sales revenue of Beijing's auto market in 2011 might shrink by 60 billion yuan (about 9.1 billion U.S. dollars) due to the city limiting the number of cars purchased each month, a commerce official said Saturday.Car sales revenue will drop to 100 billion yuan in 2011 from last year's 160 billion yuan, Wang Shuxia, chief for marketing section with the Beijing Municipal Commission of Commerce, told a working meeting of the commission.A control on car purchases introduced this year limits new car license plates to 240,000 in 2011, said Wang.In 2010, more than 800,000 new cars drove onto Beijing's roads, worsening the chronic gridlock in this Chinese national capital of nearly 5 million automobiles.Wang estimated that Beijing's car sales this year will hit 580,000 units, as some cars will be sold to buyers outside of Beijing while others will be purchased by buyers who are replacing older cars.Car owners who replace their old vehicles can obtain car license plates directly without taking part in the lottery that allots 20,000 new plates each month.

来源：资阳报