濮阳东方男科治病便宜(濮阳东方医院价格便宜) (今日更新中)

WASHINGTON, Dec. 5 (Xinhua) -- NASA's Kepler mission has confirmed its first planet in the "habitable zone," a region where liquid water could exist on a planet's surface, the U.S. space agency announced on Monday.The newly-confirmed planet, Kepler-22b, is the smallest yet found to orbit in the middle of the habitable zone of a star similar to Sun. The planet is about 2.4 times the radius of Earth. Scientists don't yet know if Kepler-22b has a predominantly rocky, gaseous or liquid composition, but its discovery is a step closer to finding Earth-like planets.Previous research hinted at the existence of near-Earth-size planets in habitable zones, but clear confirmation proved elusive. Two other small planets orbiting stars smaller and cooler than Sun recently were confirmed on the very edges of the habitable zone, with orbits more closely resembling those of Venus and Mars.Kepler-22's star is a bit smaller than our sun, so its habitable zone is slightly closer in. The diagram shows an artist's rendering of the planet comfortably orbiting within the habitable zone, similar to where Earth circles the sun. Kepler-22b has a yearly orbit of 289 days. The planet is the smallest known to orbit in the middle of the habitable zone of a sun-like star. It's about 2.4 times the size of Earth."This is a major milestone on the road to finding Earth's twin, " said Douglas Hudgins, Kepler program scientist at the NASA Headquarters in Washington. "Kepler's results continue to demonstrate the importance of NASA's science missions, which aim to answer some of the biggest questions about our place in the universe."Kepler discovers planets and planet candidates by measuring dips in the brightness of more than 150,000 stars to search for planets that cross in front, or "transit," the stars. Kepler requires at least three transits to verify a signal as a planet."Fortune smiled upon us with the detection of this planet," said William Borucki, Kepler principal investigator at the NASA Ames Research Center who led the team that discovered Kepler-22b. "The first transit was captured just three days after we declared the spacecraft operationally ready. We witnessed the defining third transit over the 2010 holiday season."The Kepler science team uses ground-based telescopes and the Spitzer Space Telescope to review observations on planet candidates the spacecraft finds. The star field that Kepler observes in the constellations Cygnus and Lyra can only be seen from ground-based observatories in spring through early fall. The data from these other observations help determine which candidates can be validated as planets.Kepler-22b is located 600 light years away. While the planet is larger than Earth, its orbit of 290 days around a Sun-like star resembles that of Earth. The planet's host star belongs to the same class as Sun, called G-type, although it is slightly smaller and cooler.Of the 54 habitable-zone planet candidates reported in February 2011, Kepler-22b is the first to be confirmed. This finding will be published in The Astrophysical Journal.

BEIJING, Jan. 14 (Xinhua) -- A Spring Festival gala was held at the Great Hall of the People Saturday to entertain the country's military officers, soldiers and civilians.Representatives of officers and soldiers in the military units and armed police forces in Beijing as well as some Beijing residents attended the gala.President Hu Jintao and other top Chinese leaders including Wu Bangguo, Jia Qinglin, Li Changchun, Xi Jinping, Li Keqiang, He Guoqiang and Zhou Yongkang were also present at the gala.Hu expressed greetings to the audience and extended his good wishes for them, ahead of the traditional Spring Festival, or the Chinese Lunar New Year, which falls on Jan. 23 this year.

BEIJING, Dec. 23 (Xinhua) -- The personal information of more than 6 million Internet users on CSDN, or China Software Developer Network, the country's largest programmers' website, was leaked by hackers, raising concerns about web security and triggering widespread panic.The leak was first exposed by China's leading anti-virus software provider, Beijing-based Qihoo 360, on Wednesday. The company said the leak included user IDs, passwords and e-mail addresses in clear text.The hacking case escalated on Thursday after the personal details of subscribers to more websites, including popular online gaming and social networking sites, were leaked.Online media reports said the personal data of up to 50 million Internet users has been leaked so far, but the number could not be independently verified.In response, the National Computer Network Emergency Response Technical Team/Coordination Center of China (CNCERT/CC) issued a statement Thursday, saying the CSDN's user data bank that leaked on the Internet was created before April 2009 and the passwords were stored in clear text, but the passwords had been encrypted after the data bank was upgraded in April 2009."Therefore, similar security problems have not been found in the newest user data bank," the statement said.Technical experts are investigating how many websites and users were actually involved in the hacking case, said Zhou Yonglin, director of the CNCERT/CC Operating Department."False information and exaggerations cannot be ruled out," he said.Nevertheless, CNCERT/CC has ordered CSDN to take immediate action in repairing the system hazards and providing users with timely security solutions.Computer security experts at Qihoo 360 believe the leak has spread to other websites."Many Internet users have registered the same passwords for their e-mail, microblog, online gaming and online payment accounts, so, if the server of one of the websites is hacked, their accounts and passwords on other websites would also be stolen," said Qihoo 360's Dr. Shi Xiaohong.Police authorities in Beijing told Xinhua on Friday that an investigation has been launched.WEB SECURITY IN QUESTIONDisgruntled Internet users in China rushed to change their passwords after the leak occurred, the largest of its kind in the history of China's Internet development."It is very annoying. I had to spend almost an hour changing the passwords of all my online accounts, especially those for payment accounts," said Li Xing, a white-collar worker at a technical company in Beijing.

BEIJING, Oct. 2 (Xinhua) -- Chinese archeologists have found evidence indicating that the mysterious ancient city of Loulan (Kroraina) once had highly-developed agricultural systems.Scientists from the Institute of Geology and Geophysics under the Chinese Academy of Sciences conducted remote sensing procedures, field investigations and sample testing in the area and found that there were once large tracts of farmlands in Loulan.The farmland featured regular and straight circumferences stretching for 200 to 1,000 meters as well as irrigation ditches running throughout, said Qin Xiaoguang, a member of the research team.Moreover, researchers found grain particles in the area's ground surface, which are very likely to be remains of crop plants, Qin said.These findings show that irrigation farming had been practiced in Loulan for at least 100 years, Qin said.Qin said they also found canal remains measuring 10 to 20 meters wide and 1.6 meters deep in the Loulan relics, indicating that the city, which is suspected of perishing in drought, was once rich in water resources.The ancient city was a pivotal stop along the famous Silk Road, but mysteriously disappeared around the third century AD.Previous historical records suggested that Loulan's economy was sustained by widespread agricultural activity, but no remains or other evidence had been found before the most recent discoveries.

来源：资阳报