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LOS ANGELES, April 7 (Xinhua) -- Using NASA's Galaxy Evolution Explorer (GEE) satellite, U.S. astronomers are hunting for nearby, hard-to-see stars which could very well be home to the easiest-to-see alien planets, it was announced on Thursday.U.S. astronomers are ferreting out the new targets after the glare of bright, shining stars has frustrated most efforts at visualizing distant worlds, NASA's Jet Propulsion Laboratory (JPL) said.So far, only a handful of distant planets, or exoplanets, have been directly imaged. Small, newborn stars are less blinding, making the planets easier to see, but the fact that these stars are dim means they are hard to find in the first place."Fortunately, the young stars emit more ultraviolet light than their older counterparts, which makes them conspicuous to the ultraviolet-detecting GEE," JPL said in a press release."We've discovered a new technique of using ultraviolet light to search for young, low-mass stars near the Earth," said David Rodriguez, a graduate student of astronomy at University of Californian, Los Angeles. "These young stars make excellent targets for future direct imaging of exoplanets."Young stars, like human children, tend to be a bit unruly -- they spout a greater proportion of energetic X-rays and ultraviolet light than more mature stars. In some cases, X-ray surveys can pick out these youngsters due to the "racket" they cause. However, many smaller, less "noisy" baby stars perfect for exoplanet imaging studies have gone undetected except in the most detailed X-ray surveys. To date, such surveys have covered only a small percentage of the sky, according to JPL in Pasadena, Los Angeles.Rodriguez and his team figured that the GEE, which has scanned about three-quarters of the sky in ultraviolet light, could fill this gap.Astronomers compared readings from the telescope with optical and infrared data to look for the telltale signature of rambunctious junior stars. Follow-up observations of 24 candidates identified in this manner determined that 17 of the stars showed clear signs of youth, validating the team's approach, JPL said."The Galaxy Evolution Explorer can readily select young, low- mass stars that are too faint to turn up in all-sky X-ray surveys, which makes the telescope an incredibly useful tool," Rodriguez said in the release.

ACCRA, Feb. 12 (Xinhua) -- China would in the coming years inject more capital to support the infrastructure needs of Ghana, Chinese Ambassador to Ghana Gong Jianzhong has said.Briefing the media here on Friday night to announce the visit to Ghana by Chen Deming, the Chinese Minister of Commerce, Ambassador Gong said that China is willing to join in the infrastructure development of Ghana."We are willing to join Ghana in improving its infrastructure base. We will be happy to give our contribution towards the infrastructure development of Ghana," he said.The forthcoming two-day visit by the Chinese minister would afford the two countries to further cement, promote and syncretize the bilateral trade and economic corporation existing between them for more than five decades.The ambassador said the Chinese Embassy in Ghana is committed to offering quality service to Ghanaians engaging in bilateral exchanges and cooperation in different fields.Currently, China has supported the West African country in the construction of various roads, rails, school blocks, hospitals, among others.He called on the Chinese firms in Ghana to raise investments and take corporate social responsibilities in local communities where they are operating.

CHICAGO, Jan. 21 (Xinhua) -- Chinese President Hu Jintao left Chicago for China on Friday after concluding a state visit to the United States, during which he and his U.S. counterpart Barack Obama agreed to build a China-U.S. cooperative partnership based on mutual respect and mutual benefit.Hu, who began his four-day visit Tuesday, had extensive and in-depth discussions with Obama at the White House on Wednesday on major bilateral, regional and world issues.Chinese President Hu Jintao shakes hands with U.S. President Barack Obama during a bilateral meeting at the White House in Washington, the United States, Jan. 19, 2011.The two sides reached "important agreement on China-U.S. relations and major international and regional issues of shared interests," the Chinese president said when he and Obama met the press following their discussions."We both agree to further push forward the positive, cooperative and comprehensive China-U.S. relationship," Hu said, adding that both sides also pledged to forge "a China-U.S. cooperative partnership based on mutual respect and mutual benefit" for the benefit of the two countries and beyond.

PARIS, April 22 (Xinhua) -- Heavy load launcher Ariane 5 lifted off two communication satellites, Yahsat Y1A and Intelsat New Dawn, at around 6:37 p.m. local time (2137 GMT) on Friday from Europe's Spaceport in French Guiana.Yahsat Y1A is the first United Arab Emirates satellite launched by Arianespace. It is built by Astrium and Thales Alenia Space and will be positioned at 52.5 degrees East. With a design life of 15 years, it will be operated by the Al Yah Satellite Communications Company, a telecommunications company indirectly controlled by the Abu Dhabi Government.Weighing around 5,935 kilograms at lift-off, Yahsat Y1A was expected to be separated first around 27 minutes after the launcher started the flight.The second passenger Intelsat New Dawn was built by Orbital Sciences Corporation and weighs about 3,000 kilograms. Also with a designed life span of 15 years, it is planned to be positioned at 32.8 degrees East.Via the second mission of Ariane 5 in 2011, Yahsat Y1A will provide customized relay services for the government and commercial sectors in the Middle East, Africa, Europe and Southwest Asia, while Intelsat New Dawn will work as a part of the global Intelsat fleet, offering service for Africa.This launch, the 201st of an Ariane family vehicle since 1979, brought to 22 the number of Intelsat satellites serving Africa, according to the launching company.Originally scheduled for liftoff on March 30, this dual-payload mission was delayed following an interruption of the final countdown when an incorrect displacement of one of the engine's actuators was detected, Arianespace said in a statement. The launching center planned to have six liftoffs of Ariane 5 through this year.

BEIJING, Feb. 19 (Xinhua) -- Chinese Vice Premier Li Keqiang has demanded the comprehensive enforcement of the country's food safety laws, urging checks to be tightened against unsafe food products.China should enhance efforts to ensure food safety, which is crucial for protecting human lives and improving people's living standards, Li said while addressing a meeting on food safety on Friday, according to an official statement issued Saturday.Also, emphasis should be directed to both special campaigns, which are launched to check against unsafe food, as well as daily supervision of food manufacturers, he said.The meeting also heard reports on food safety delivered by officials from health and agriculture ministries, the State Administration for Industry and Commerce, and the General Administration of Quality Supervision, Inspection and Quarantine.Participants at the meeting agreed that China should improve its system to monitor and assess food safety risks and enhance emergency response capabilities in this regard.They also called for improvement of food safety-related laws and regulations, as well as measures to target those core factors that affect the safety of food products.At the meeting, local government departments were asked to closely cooperate and improve the system to ensure food safety.Further, the participants agreed that authorities should publicize accurate information about food safety in a timely manner, and do more to forge a social atmosphere favorable for ensuring food safety.

来源：资阳报