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BEIJING, Oct. 26 (Xinhuanet) -- The question, why the first documented supernova was super-sized and grew so fast, has puzzled astronomers for centuries. Now it is solved by US researchers.The supernova, an exploded star, was observed in 185 A.D. and documented as a mysterious "guest star" by Chinese astronomers. It was visible for eight months.Scientists later found the supernova, 8,000 light years away, was a bigger-than-expected supernova remnant. BBC reported that if the infrared light it emits could be seen by human eyes, it would appear to be as large as the full Moon in the sky.Through observations in space telescopes, researchers of a latest study revealed that the explosion took place in a cavity in space, which allowed the star's remains to travel out much faster and farther. The study was published online in the Astrophysical Journal Monday.The supernova was "two to three times bigger than we would expect for a supernova that was witnessed exploding nearly 2,000 years ago. Now, we've been able to finally pinpoint the cause," stated Brian Williams, lead author of the study and an astronomer at North Carolina State University in Raleigh.

BEIJING, Nov. 16 (Xinhua) -- A senior Chinese commerce official said on Wednesday that the country will work to optimize the import mix of mechanical and electronic products so they can play a bigger role in China's restructuring efforts.Li Jinzao, vice minister of the Ministry of Commerce, made the remarks at a forum of the ongoing 13th "China Hi-Tech Fair" in Shenzhen.His remarks echoed a guideline issued in March on promoting the imports of mechanical and electronic products during the 2011-2015 period, in which China pledged efforts to encourage the imports of high-tech products.Li said that China will improve existing policies to attach more importance to the imports of advanced technology, equipment and components to spur innovation.Meanwhile, he said China will organize more trading events to exchange and cooperate with international businesses, and will continue to push the United States and European countries to ease restrictions on civil high-tech exports to China.

BEIJING, Jan. 1 (Xinhua) -- State Grid Corporation of China (SGCC), the country's largest power supplier, said Sunday it has put to trial operation a cross-border electricity transmission project in northeastern Heilongjiang province to supply Chinese with Russia's electric power exports.The electric power SGCC purchased from Russia began reaching Chinese customers late Saturday night after the completion of the direct-current back-to-back networking substation, or called "the trans-Amur project" by Russians, SGCC said in a statement on its website.The trial operation will last 168 hours, SGCC said in the statement.With a transmission capacity of 750 mega-watts, the electricity transmission project is China's biggest cross-border power line, according to SGCC."The implementation of the project will gain experience for the expansion of Sino-Russian energy cooperation and help promote the economic development for both countries," SGCC said.The project is also part of the Sino-Russian energy and trade cooperation.Russian Deputy Energy Minister Andrei Shishkin said in June 2011 that the transmission project would increase Russia's power supply to five or six billion kilowatt hours of electricity to China and Russia intended to increase its electricity supply to China in the coming years.Russian companies plan export 60 billion kwh of electricity to China by 2020. Power plants will be built along its border with China to reduce power transmission losses and reduce transportation costs.Also on Sunday, an oil pipeline linking Russia's far east and northeast China witnessed its one year anniversary of operation, as operators announced an accumulated 15 million tonnes of oil had been transported into China in 2011.

BEIJING, Jan. 9 (Xinhua) -- The United States Treasury Secretary Timothy Geithner will discuss economic ties and exchange views with Chinese officials on the global economic situation during his trip to China, Foreign Ministry spokesman Liu Weimin said on Monday.Liu said at a regular press briefing that Geithner will visit China from Jan. 10 to 11 as the U.S. President's special representative. Premier Wen Jiabao, Vice President Xi Jinping, Vice Premier Li Keqiang and Vice Premier Wang Qishan will meet with him during the visit.Liu said China and the U.S. have agreed to build a partnership of cooperation based on mutual respect and mutual benefit."The global economic and financial situation is facing severe challenges. Further strengthening China-U.S. economic and trade cooperation will be helpful in meeting these challenges," Liu said."China has proposed further promoting the two countries' economic and trade cooperation and hopes the U.S. will work with China toward this end," Liu said.

BEIJING, Dec. 4 (Xinhua) - Orthopaedic experts have warned that China should improve its prevention of orthopaedic illnesses as its population ages.Osteoporosis, bone fractures and joint diseases, to which elderly people are particularly susceptible, have surged as serious health concerns, said Feng Huicheng, surgeon-in-chief of a leading Chinese orthopaedics hospital, at the Sixth International Congress of the Chinese Orthopaedic Association (COA) Sunday in Beijing.According to China's latest census in 2010, the number of people aged 60 and over stood at 177.65 million and accounted for more than 13 percent of the country's total 1.3 billion population."Orthopaedic diseases pose a great threat to the elderly, and they'll only grow more serious as we have a large population that is aging," said Dr. Feng from the No. 309 Hospital of the People's Liberation Army."The younger generation should start to be concerned with their health now, particularly calcium loss, to prevent osteoporosis when getting old.".A report issued by the International Osteoporosis Foundation this year shows that about 70 million people in China now suffer from the condition and that number may leap to 286 million by 2020.H.K.T.Raza, president of the Asia Pacific Orthopaedic Association, said at the conference that the prevention of osteoporosis should begin when people are still young."Osteoporosis is best prevented by regular exercises and good dietary controls. All that has to be done early in life, maybe between 20 and 30, to prevent the disease," he said.According to the World Health Organization, osteoporosis remains one of the primary threats to the health of the middle-aged and elderly.Osteoporosis is the thinning of bone tissue and loss of bone density over time. Parts of the bone grow weak and prone to fracture. Women are usually subject to greater risk of osteoporosis than men as they start with lower bone density and lose bone mass faster as they age. 

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