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WASHINGTON, May 27 (Xinhua) -- Two U.S. astronauts conducted the fourth and final scheduled spacewalks for space shuttle Endeavour 's STS-134 mission on Friday morning, the U.S. National Aeronautics and Space Administration (NASA) announced.The seven-hour, 24-minute spacewalk completed by Mike Fincke and Greg Chamitoff at 7:39 a.m. EDT (1139 GMT) was the final spacewalk conducted by space shuttle astronauts before NASA turns over Endeavour and sister ships Discovery and Atlantis to museums. Space station crew will continue to make spacewalks for maintenance and repair tasks.At 5:02 a.m. (0902 GMT), Fincke and Chamitoff surpassed the 1, 000th hour astronauts and cosmonauts have spent spacewalking in support of space station assembly and maintenance. The milestone occurred four hours and 47 minutes into the spacewalk, the 159th in support of station assembly and maintenance, totaling 1,002 hours, 37 minutes.The astronauts completed their mission to stow the 50-foot-long boom on the station truss and work on some new installations to extend the space station's robotic arm. After that, shuttle commander Mark Kelly called Mission Control in Houston to mark the milestone -- after 12 years of efforts."Space station assembly is complete," Kelly said.It was the 248th spacewalk U.S. astronauts have conducted and the 118th from space station airlocks. Landing is scheduled for 2: 32 a.m. EDT (0632 GMT) on Wednesday at the Kennedy Space Center in Florida. Shuttle Atlantis is targeted to launch on July 8 for space shuttle's final flight.Endeavour lifted off on May 16 from the Kennedy Space Center in Florida, to deliver to the International Space Station a 2-billion- dollar, multinational particle detector known as the Alpha Magnetic Spectrometer (AMS).AMS, a particle physics detector, is designed to search for various types of unusual matter by measuring cosmic rays. Its experiments are designed to help researchers study the formation of the universe and search for evidence of dark matter, strange matter and antimatter.NASA's 30-year-old shuttle program is ending due to high operating costs. The Obama administration wants to spur private companies to get into the space taxi business, freeing NASA to focus on deep space exploration and new technology development.When the U.S. space shuttle program officially ends later this year, the Russian space program's Soyuz capsule will be the only method for transporting astronauts to and from the station.

WASHINGTON, May 20 (Xinhua) -- Two U.S. astronauts conducted the first of four spacewalks for space shuttle Endeavour's STS-134 mission on Friday morning, the U.S. National Aeronautics and Space Administration (NASA) said.According to the U.S. space agency, Endeavour's mission specialists Andrew Feustel and Greg Chamitoff completed the six-hour, 19-minute spacewalk at 9:29 a.m. EDT (1329 GMT). They successfully installed antennas for the External Wireless Communication system, routing cables, setting up the antenna, installing handrails, and connecting power cables.Because of a carbon dioxide sensor failure in Chamitoff's spacesuit, flight controllers limited his spacewalk time to about six hours 20 minutes, 10 minutes less than the planned six hours and 30 minutes. There was no indication his suit's carbon dioxide levels would rise. However, they deferred tasks to remove a micrometeoroid debris shield to access and attach some of the connection points.This was the 245th spacewalk conducted by U.S. astronauts. It was Feustel's fourth spacewalk for a total time of 27 hours and 17 minutes, and Chamitoff's first.Endeavour lifted off on Monday morning from Kennedy Space Center in Florida, to deliver to the International Space Station a 2-billion-dollar, multinational particle detector known as the Alpha Magnetic Spectrometer (AMS).AMS, a particle physics detector, is designed to search for various types of unusual matter by measuring cosmic rays. Its experiments are designed to help researchers study the formation of the universe and search for evidence of dark matter, strange matter and antimatter.

BEIJING, Feb. 13 (Xinhua) -- Snow fell again in Beijing Saturday night, three days after the city had its first snow this winter.Snow continued falling on Sunday morning but was forecasted to stop in the daytime.From 8:00 p.m. Saturday to 8:00 a.m. Sunday, precipitation in Beijing averaged 1.7 mm to 3.1 mm in downtown areas, local meteorologists said.Zhang Qiang, head of the municipal artificial weather intervention office, said the office began cloud seeding and was continuing efforts to increase snowfall from 7:25 p.m. Saturday in the nine districts and counties of Miyun, Mentougou, Yanqing, Haidian, Pinggu, Changping, Shijingshan, Fangshan and Huairou.By 8:20 a.m. Sunday, 657 silver iodide rods had been used to increase the snowfall.More than 3,583 people and 768 vehicles have been mobilized since Saturday to clear the snow on major roads of Beijing to ensure road transportation, according to the city transportation departments.Beijing had its first snow of the winter Wednesday and Thursday after 108 days of zero precipitation.Meteorologists said the snowfall in Beijing had helped ease the pressure of drought."Beijing is expected to have another cold front from Feb. 15 to Feb. 16, but it is not sure if there will be another snowfall then," said Liao Xiaonong, chief weatherman with the Beijing Meteorological Bureau.

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.

BEIJING, May 10 (Xinhuanet) -- YouTube is adding more than 3,000 mainstream movies to its movie-rental service, media reports said Tuesday.Google Inc-owned YouTube is offering a mix of recent Hollywood blockbusters, independent and foreign movies for 99 cents up to 3.99 U.S. dollars each.The additions will push YouTube’s total movie rentals available to more than 6,000.In addition, hundreds of movies, including some offered before the latest launch, are available for free viewing as with other clips.“By expanding our content partnerships worldwide and stimulating the success of budding filmmakers, artists and entrepreneurs, we’ll ensure that YouTube remains the best place for the world to see and discover rich talent,” Salar Kamangar, head of YouTube, said.YouTube, which built a following by letting users post home videos and amateur clips, is counting on professionally produced content to draw more visitors and keep them on the site longer.YouTube users currently spend about 15 minutes on the site per day on average, compared with the five hours they spend on television, the company said.

来源：资阳报