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LOS ANGELES, April 8 (Xinhua) -- NASA's Wide-field Infrared Survey Explorer (WISE) has discovered a rare asteroid that traces out a horseshoe shape relative to Earth, the Jet Propulsion Laboratory (JPL) said on Friday.Unlike most near-Earth asteroids (NEAs) that have eccentric, or egg-shaped, orbits that take the asteroids right through the inner solar system, the new object has an orbit that is almost circular such that it cannot come close to any other planet in the solar system except Earth, JPL said.However, even though the asteroid rides around with Earth, it never gets that close, said JPL in Pasadena, Los Angeles.As the asteroid approaches Earth, the planet's gravity causes the object to shift back into a larger orbit that takes longer to go around the sun than Earth. Alternately, as Earth catches up with the asteroid, the planet's gravity causes it to fall into a closer orbit that takes less time to go around the sun than Earth, according to JPL.The asteroid therefore never completely passes our planet. This slingshot-like effect results in a horseshoe-shaped path as seen from Earth, in which the new object, designated 2010 SO16, takes 175 years to get from one end of the horseshoe to the other, JPL said."The origins of this object could prove to be very interesting, " said Amy Mainzer of JPL, the principal investigator of NEOWISE, which is the asteroid- and comet-hunting portion of the WISE survey mission. "We are really excited that the astronomy community is already finding treasures in the NEOWISE data that have been released so far."JPL manages and operates the WISE for NASA's Science Mission Directorate, Washington.

WINDHOEK, May 21 (Xinhua) -- Top Chinese legislator Wu Bangguo on Saturday met with Namibian President Hifikepunye Pohamba on advancing the bilateral cooperation to further develop the partnership with Namibia.Wu, chairman of the National People's Congress (NPC) Standing Committee, China's top legislative body, extended Chinese President Hu Jintao's greetings to Pohamba and hailed an "all- weather" partnership forged between the two nations.Namibia is one of the youngest states in Africa, which became fully independent in 1990.Wu reviewed the profound friendship between the two countries, which established diplomatic ties one day after Namibia's announcement of its full independence.Wu said the two countries have reaped good harvests in cooperation in the fields of politics, trade, culture, education, public health and culture in recent years, which has already set a model for countries engaged in the South-South cooperation.He also highlighted the mutual understanding and support on issues concerning each other's core interests, and to bring the bilateral economic and trade cooperation to a new high, Wu put forward a three-point proposal concerning the importation of the husbandry and aquatic products, resource and mining as well as the infrastructure construction.Namibia is a nation with significant influence in the southern Africa, Wu said, vowing that China will work with the Namibian side to push the bilateral partnership to a higher level.For his part, Pohamba welcomed Wu's visit, the first one ever paid by a Chinese top legislator, and spoke highly of China's long-standing support for Namibia's national liberation and construction.Namibia will develop the long-term and strategic cooperation in a much broader domain with China and welcomes more Chinese businesses to invest in the country, the Namibian president said.On the China-Afrcia relationship, the two leaders stressed that the two sides should work closer under the framework of the Forum of China-Africa Cooperation to boost political mutual trust, substantial and pragmatic cooperation on trade and humanitarian exchanges, especially those among the young generations, so as to further enrich a new China-Africa partnership.Namibia is the first leg of Wu's 12-day African-Asian tour. He will also visit Angola, South Africa and Maldives.

SAN FRANCISCO, March 21 (Xinhua) -- Microsoft on Monday sued Barnes & Noble, claiming patent infringement by the largest book retailer in the United States.Microsoft said it filed legal actions on Monday in both the U.S. International Trade Commission and the U.S. District Court of the Western District of Washington against Barnes & Noble, as well as Foxconn and Inventec, two manufacturers of Barnes & Noble's devices.According to Microsoft, the actions focus on the patent infringement by Barnes & Noble's Nook e-reader and tablet, both of which run Google's Android operating system.The patents at issue cover a range of functionality embodied in Android devices that are essential to the user experience, including natural ways of interacting with devices by tabbing through various screens to find the information they need, surfing the Web more quickly and interacting with documents and e-books, Microsoft said in a press release."The Android platform infringes a number of Microsoft's patents, and companies manufacturing and shipping Android devices must respect our intellectual property rights," Horacio Gutierrez, Microsoft's corporate vice president and deputy general counsel, was quoted by the press release as saying.Writing in a separate company blog post, Gutierrez said that the latest actions bring to 25 the total number of Microsoft patents in litigation for infringement by Android smartphones, tablets and other devices.He noted that Microsoft has established a licensing program to address Android's ongoing infringement, and leading Android smartphone manufacturer HTC has taken a license under this program.Amazon.com also signed a patent license with Microsoft last year covering its Kindle e-reader, he added."Unfortunately, after more than a year of discussions, Barnes & Noble, Foxconn and Inventec have so far been unwilling to sign a license, and therefore, we have no other choice but to bring legal action to defend our innovations," Gutierrez said in the blog post.

来源：资阳报