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WASHINGTON, Dec. 20 (Xinhua) -- NASA's Kepler mission has discovered the first Earth-size planets orbiting a sun-like star outside our solar system, the U.S. space agency announce Tuesday.The planets, called Kepler-20e and Kepler-20f, are too close to their star to be in the so-called habitable zone where liquid water could exist on a planet's surface, but they are the smallest exoplanets ever confirmed around a star like our sun, according to NASA.The discovery marks the next important milestone in the ultimate search for planets like Earth. The new planets are thought to be rocky. Kepler-20e is slightly smaller than Venus, measuring 0.87 times the radius of Earth. Kepler-20f is slightly larger than Earth, measuring 1.03 times its radius. Both planets reside in a five-planet system called Kepler-20, approximately 1, 000 light-years away in the constellation Lyra.Kepler-20e orbits its parent star every 6.1 days and Kepler-20f every 19.6 days. These short orbital periods mean very hot, inhospitable worlds. Kepler-20f, at 800 degrees Fahrenheit, is similar to an average day on the planet Mercury. The surface temperature of Kepler-20e, at more than 1,400 degrees Fahrenheit, would melt glass."The primary goal of the Kepler mission is to find Earth-sized planets in the habitable zone," said Francois Fressin of the Harvard-Smithsonian Center for Astrophysics, lead author of a new study published in the journal Nature. "This discovery demonstrates for the first time that Earth-size planets exist around other stars, and that we are able to detect them."The Kepler-20 system includes three other planets that are larger than Earth but smaller than Neptune. Kepler-20b, the closest planet, Kepler-20c, the third planet, and Kepler-20d, the fifth planet, orbit their star every 3.7, 10.9 and 77.6 days. All five planets have orbits lying roughly within Mercury's orbit in our solar system. The host star belongs to the same G-type class as our sun, although it is slightly smaller and cooler.

SAN FRANCISCO, Nov. 11 (Xinhua) -- Apple on Friday said it will "continue to investigate" the unexpected iPhone battery drain as some users still see the problems after downloading a latest software update designed to address the issues."The recent iOS software update addressed many of the battery issues that some customers experienced on their iOS 5 devices. We continue to investigate a few remaining issues," said Apple in a statement made to technology news site AllThingsD.Apple released iOS 5.0.1, an update to its latest mobile operating system iOS 5 on Thursday. The update includes fixes for some bugs which are blamed for shortening the battery life of iPhones and other devices that use the system.Some users said the battery life of their iPhones look much better after the update. But according to some posts on Apple's official support forums, some iPhone owners still claimed the issue is persisting, saying they saw no difference at all after downloading the update.Complaints about the battery life of Apple's latest iPhone 4S smartphone have been piling up on the Internet in the past weeks.On Apple's official support forums, some iPhone 4S owners said their handsets' battery drained more than 10 percent every hour, even when in standby mode with some advanced features like Siri and location services completely deactivated.It is reported that Apple engineers contacted some iPhone 4S owners in Britain and installed a diagnosis file on their devices to send details back to the company's headquarters in Cupertino, California.Apple confirmed the iPhone battery issue last Wednesday, saying that a few bugs in the iOS system have caused the problem and it will release a software update in a few weeks.

BEIJING, Nov. 9 (Xinhua) -- A Chinese Mars orbiter named Yinghuo-1 was successfully launched on Wednesday morning from Russian-leased Baikonur cosmodrome in Kazakhstan, China's authorities said. The orbiter was launched by a Zenit-2 booster rocket at 4:16 a.m. Beijing time Wednesday (2016 GMT Tuesday), hitching a ride on Russia's Phobos-Grunt (Phobos-Soil) craft, an unmanned probe on Phobos, a moon of Mars, said China's State Administration for Sciences, Technology, and Industry for National Defence.

BEIJING, Dec. 4 (Xinhua) -- Acclaimed orthopaedic surgeons and experts attending a major conference in Beijing have agreed to build up a platform for international cooperation aiming at jointly coping with medical and social challenges.At the Sixth International Congress of the Chinese Orthopaedic Association (COA) that concluded on Sunday, presidents of more than 80 national and international orthopaedic societies signed a declaration which seeks a model for both developing and developed countries to help reduce medical costs in the aftermath of the global financial crisis.With an aging global population, rapidly rising medical costs have become a heavy financial burden for governments worldwide. Medical insurance cost control has become a hot topic around the world.Bone and joint diseases, infections due to traffic accident traumas and other diseases causing high disability rates have affected millions of people worldwide."One of the objectives of the COA international conference is to provide a platform for medical experts around the world to discuss not only clinical techniques but also medical and social problems," said Professor Wang Yan, chairman of the COA.To fully leverage existing professional knowledge and resources, presidents of orthopaedic organizations attending the conference adopted and released the Beijing Declaration which calls for a platform to enhance global and national collaboration and partnerships among the professions, industries and related patient organizations and disciplines.The declaration also stresses maximizing Internet-based learning and encouraging international exchanges."Worldwide, I have one lament, that we've spent so much money on medical research, but very little on orthopaedics. Most governments are more anxious to fund cancer or infectious diseases," said Professor Michael Huggness, president of the North American Spine Society."We think we're a bit handicapped by not having the money to pursue the research. As we get more sophisticated in our treatment, the price does go up. My expectation is that in another five to 10 years, we'll begin to apply some molecular techniques to assist us in healing. Maybe the price will come down when our knowledge base increases. But I think we'll just have to wait for a bit more research and a bit more basic science.""We definitely will... look into this issue of how we can have a suitably assigned budget from the government for orthopaedic care," said Professor K.M. Chan, from the Prince of Wales Hospital in Hong Kong."At the same time, we use evidence-based medicine to contain the medical cost in orthopaedics with very stringent monitors from the professions. That involves good-practice models, quality insurance and patient safety. With all these, we expect that the profession will be heading forward to join hands with the government to contain the cost."More than 15,000 surgeons, researchers and business representatives from China and abroad are attending the four-day annual conference to share the latest theories and techniques for curing musculoskeletal diseases as well as related social topics.Founded in 1980, the COA now has more than 30,000 registered members and is the largest sub-society of doctors under the Chinese Medical Association. The conference is the largest medical academic event in China.

NANCHANG, Oct. 1 (Xinhua) -- A copper sword dating back more than 2,200 years has been discovered in east China's Jiangxi Province, local archaeologists said.The design and shape of the sword indicate that it was forged during the Warring States Period (475 BC - 221 BC), according to Li Guoli, curator of the Nanchang Museum, where the sword is currently being stored.Despite having little aesthetic or scientific value due to a lack of decor or inscriptions, the sword still offers insights into the type of military equipment used during the period, Li said.The identity of the sword's original owner and the precise location where the sword was forged and used are still unknown, Li said.The sword was discovered by a laborer surnamed Xiong in Jiangxi's capital of Nanchang. Xiong found the sword while sorting and cleaning stones that had been dredged up from a riverbank.An argument between Xiong and another worker who was trying to claim the sword aroused attention from the local law enforcement, who then convinced Xiong to turn the sword over to archaeological authorities.