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WASHINGTON, June 9 (Xinhua) -- Observations from NASA's Voyager spacecraft suggest the edge of our solar system may not be smooth, but filled with a turbulent sea of magnetic bubbles, the U.S. space agency said Thursday in a statement.While using a new computer model to analyze Voyager data, scientists found the sun's distant magnetic field is made up of bubbles approximately 100 million miles wide. The bubbles are created when magnetic field lines reorganize. The new model suggests the field lines are broken up into self-contained structures disconnected from the solar magnetic field. The findings are described Thursday in the Astrophysical Journal.Like Earth, our sun has a magnetic field with a north pole and a south pole. The field lines are stretched outward by the solar wind or a stream of charged particles emanating from the star that interacts with material expelled from others in our corner of the Milky Way galaxy.The Voyager spacecraft, more than nine billion miles away from Earth, are traveling in a boundary region. In that area, the solar wind and magnetic field are affected by material expelled from other stars in our corner of the Milky Way galaxy."The sun's magnetic field extends all the way to the edge of the solar system," said astronomer Merav Opher of Boston University. "Because the sun spins, its magnetic field becomes twisted and wrinkled, a bit like a ballerina's skirt. Far, far away from the sun, where the Voyagers are, the folds of the skirt bunch up."Understanding the structure of the sun's magnetic field will allow scientists to explain how galactic cosmic rays enter our solar system and help define how the star interacts with the rest of the galaxy.So far, much of the evidence for the existence of the bubbles originates from an instrument aboard the spacecraft that measures energetic particles. Investigators are studying more information and hoping to find signatures of the bubbles in the Voyager magnetic field data."We are still trying to wrap our minds around the implications of the findings," said University of Maryland physicist Jim Drake, one of Opher's colleagues.Launched in 1977, the Voyager twin spacecraft have been on a 33- year journey. They are en route to reach the edge of interstellar space. NASA's Jet Propulsion Laboratory built the spacecraft and continues to operate them.

WUHAN, Aug. 6 (Xinhua) -- A Chinese man nearing 80 years old was recently diagnosed with HIV and doctors say he probably caught the virus through having "frequent unprotected sex."The case is the latest to support the opinions of experts who believe the virus is spreading fast among older Chinese men who have been largely neglected in the country's anti-AIDS campaigns.The latest diagnosed man, whose identity has been concealed for privacy reasons, was admitted to Zhongnan Hospital in central Chinese city of Wuhan with a lingering fever. He was later found to be HIV positive, doctors at the hospital said Friday.The man was widowed in his old age, has no record of blood transfusions, but had an "active unprotected sexual life," they said.Gao Shicheng, a HIV specialist in Zhongnan Hospital, said that HIV/AIDS has started to infect middle-aged and elderly Chinese men who have little or no AIDS prevention knowledge.Gao said this year alone he had diagnosed two senior men with HIV. Both contracted the virus through unprotected sex outside marriage.A recent survey conducted by the Chinese Center for Disease Control and Prevention (China CDC) shows that among the new HIV infections, the percentage of people aged 50 or above with it grew from 7.8 to 14.9 percent. Most of them were male and were found to have contracted the virus through sexual intercourse.Experts say the spread of HIV/AIDS has picked up among older Chinese men in recent years because China's senior citizens have become healthier, more open-minded about sex, and increasingly bored after retirement.They called for anti-AIDS campaigns, which usually target young people with a focus on gays, sex workers, and rural migrants, to also cover seniors in a bid to raise the awareness of HIV/AIDS prevention knowledge.China is fighting a hard battle to contain the spread of HIV/AIDS. According to a UNAIDS estimate, the country had about 740,000 people living with HIV by the end of 2009. Among them, 105,000 were estimated to have AIDS.By the end of August 2010, the cumulative total of reported HIV positives in China was 361,599, with 65,104 recorded deaths.Sex, other than blood transmission or mother-to-child transmission, has become the main channel for the spread of HIV in China.

CHANGSHA, July 17 (Xinhua) -- Chinese State Councilor Liu Yandong has called for more communications in language and culture among the people in China and foreign countries.Liu made the remarks during a meeting with the contestants of the 10th "Chinese Bridge" competition, an international Chinese proficiency competition for foreign college students, which opened Saturday in Changsha, capital of central Hunan Province.The "Chinese Bridge" competition has attracted over 100,000 college students from more than 70 countries over the past ten years, and contestants have improved their Chinese language, experienced the Chinese culture and established deep friendship with others during the competition, Liu said.She said that language is a tool for cultural communications, and linguistic learning and exchanges can promote the mankind's civilization and progress in a broader reach."The Chinese government always encourages the public, especially the youths, to learn foreign languages, and through the learning, they are enlightened on the diversified cultures around the world," she said."This also helps promote the good-will exchanges and cooperation among the Chinese and foreign peoples," she added.Liu said the Chinese government is also making efforts to meet the needs of foreign people to learn the Chinese language. She called on foreign young students to improve their Chinese proficiency and to use the Chinese language as a bridge to fell a real China in a comprehensive way.She expressed her hope that the foreign students will spread the good will and sincerity of the Chinese people to other parts of the world, in order to promote the joint efforts for the peace and prosperity of the world.

BEIJING, Sept. 26 (Xinhuanet) -- Young unmarried migrant women are facing a high risk of induced abortions in China and experts urged that they have better access to reproductive health education.Among the 8 to 10 million induced abortions performed on the mainland each year, nearly 47 percent involve unmarried women younger than 25, according to Cheng Linan, director of the center for clinical research and training of the Shanghai Institute of Planned Parenthood Research.The statistics are based on the results from a recent nationwide survey."The rising trend of induced abortions is even more evident among migrants who usually have poor awareness and access to reproductive health knowledge and services, particularly about contraception," she said on Saturday at an event to mark World Contraceptive Day, which falls on Sept 26.A 2008 survey involving more than 50,000 induced abortions in Beijing showed that roughly 70 percent of the women undergoing the procedure were migrants. For many, it was not their first abortion.According to a nationwide study by the Chinese Medical Association (CMA), of all women having received induced abortions, nearly 56 percent had two operations and 13.5 percent had three or more."That not only causes the women certain physical or mental problems, but it also gives the country a huge economic burden of more than 3 billion yuan" or about 0 million, she said.Among Chinese women who became infertile, more than 88 percent previously had an induced abortion, a study conducted in 2007 showed.Other potential health hazards include hemorrhage, uterine or pelvic infection, uterine perforation and cervical laceration.Apart from low awareness, poor access to professional consultations on contraception, particularly among single young women, is mainly the problem.A 2011 survey by the CMA found that about 44 percent of those polled said they had difficulty accessing scientifically correct contraceptive information, compared with a global average of 15.5 percent.

WASHINGTON, June 6 (Xinhua) -- Forests in many regions are becoming larger carbon sinks thanks to higher density, U.S. and European researchers say in a new report.In Europe and North America, increased density significantly raised carbon storage despite little or no expansion of forest area, according to the study, led by Aapo Rautiainen of the University of Helsinki, Finland, and published Monday in the on- line, open-access journal PLoS One.Even in the South American nations studied, more density helped maintain regional carbon levels in the face of deforestation.The researchers analyzed information from 68 nations, which together account for 72 percent of the world's forested land and 68 percent of reported carbon mass. They conclude that managing forests for timber growth and density offers a way to increase stored carbon, even with little or no expansion of forest area."In 2004 emissions and removals of carbon dioxide from land use, land-use change and forestry comprised about one fifth of total emissions. Tempering the fifth by slowing or reversing the loss of carbon in forests would be a worthwhile mitigation. The great role of density means that not only conservation of forest area but also managing denser, healthier forests can mitigate carbon emission," says Rautiainen.