济南治疗 前列腺炎多少钱济南过度手淫导致秒射怎么办,济南割包皮详细步骤,济南早泄的表现症状有哪些,济南龟头太敏感有什么药,济南勃起短怎么办,济南小便后尿道有点刺痛,济南早泄治得好了

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.

BEIJING, Oct. 18 (Xinhuanet) -- NASA recently unveiled its new rocket design, named Space Launch System (SLS), according to media reports.The rocket will make its first unmanned flight in 2017, and the flight with astronauts aboard won't happen until 2021, according to NASA's plan.The new rocket was 320 feet in length (the space shuttle was 184 feet on the launch pad), 5.5 million pounds in weight, and with the capacity of holding four astronauts at the top speed of 25,000 miles per hour, Washington Post reported Tuesday.Compared with space shuttle and other predecessors, the new rocket will aim for much farther destinations into the space with its most powerful engine ever built, according to the plan."We're investing in technologies to live and work in space, and it sets the stage for visiting asteroids and Mars," the NASA administrator Charles Bolden briefed the media at a news conference in Washington.NASA expected to devote 3 billion U.S. dollars a year to the effort, or a total of about 18 billion U.S. dollars over the next six years, said William Gerstenmaier, the agency’s associate administrator for human exploration.The current financial condition of U.S. may slow down the pace of progress, which will be much slower than NASA's Apollo heyday in the 1960s.

WASHINGTON, Nov. 22 (Xinhua) -- Long-term coffee consumption may be associated with a reduced risk for endometrial cancer, according to a study published online Tuesday in Cancer Epidemiology, Biomarkers & Prevention, a journal of the American Association for Cancer Research.Edward Giovannucci, professor of nutrition and epidemiology at the Harvard School of Public Health, said that coffee is emerging as a protective agent in cancers that are linked to obesity, estrogen and insulin."Coffee has already been shown to be protective against diabetes due to its effect on insulin," said Giovannucci, a senior researcher on the study. "So we hypothesized that we'd see a reduction in some cancers as well."The researchers observed cumulative coffee intake in relation to endometrial cancer in 67,470 women who enrolled in the Nurses' Health Study. During the course of 26 years of follow-up, researchers documented 672 cases of endometrial cancer.Drinking more than four cups of coffee per day was linked with a 25 percent reduced risk for endometrial cancer. Drinking between two and three cups per day was linked with a seven percent reduced risk.A similar link was seen in decaffeinated coffee, where drinking more than two cups per day was linked with a 22 percent reduced risk for endometrial cancer.Giovannucci said that he hopes this study will lead to further inquiries about the effect of coffee on cancer because in this and similar studies, coffee intake is self-selected and not randomized.

BEIJING, Oct. 25 (Xinhua) -- Chinese State Councilor Dai Bingguo said Tuesday that China will unswervingly pursue a path of peaceful development and play a constructive role in the United Nations.Dai made the remarks at a reception commemorating the 40th Anniversary of the restoration of the lawful seat of the People's Republic of China in the United Nations (UN).On Oct. 25, 1971, the 26th Session of the UN General Assembly adopted Resolution 2758 with an overwhelming majority and decided to restore the lawful seat of the People's Republic of China in the UN."This opened a new chapter in the external relations of the People's Republic of China and promoted the friendship and cooperation between China and all countries and peoples who love world peace and justice," Dai said at the reception hosted by the Foreign Ministry in Beijing.It also enhanced the universality, representativeness and authority of the UN and strengthened the forces for world peace and human progress, he added.He said, for the past 40 years, as the largest developing country and a permanent member of the UN Security Council, China has followed the purposes and principles of the Charter of the United Nations, called on countries across the globe to practice tolerance and live together in peace as good neighbors, and made great contributions to world peace, common development and international cooperation.This year marks the beginning of the second decade of the new century, and the world has undergone great, rapid and drastic changes, Dai said."The international community is becoming a global village and countries find interests converging in a scope and depth never seen before," he said, adding that the trend of peace, development and cooperation has gained more popular support, while the international situation remains quite fluid and complex.He said the United Nations, as the most universal, representative and authoritative inter-governmental organization, should seize opportunities and meet challenges in the political, security, economic, development, social, humanitarian, cultural, arms control, and judicial fields, among others, and reinvigorate itself with fresh vigor and vitality."Under the new circumstance, the role of the UN should only be strengthened, rather than weakened, and its authority be upheld, rather than impaired," he said.China has released the White Paper on China's Peaceful Development, which solemnly declared that China will unswervingly pursue the path of peaceful development, he said.China will work actively, through peaceful, open, scientific and common development, to expand international cooperation, take part in international affairs, honor its due international responsibilities and obligations, and play a constructive role in the UN, he said.Dai pledged that China will join other countries to make even greater contributions to building a harmonious world of durable peace and common prosperity and a brighter future for mankind.China's entry to the UN 40 years ago made the international body a more representative international organization, said Kasymzhomart Tokaev, director-general of the UN Office at Geneva.He said China has played an important role in the UN.With the rise of its global status and influence, China, as a major power, will continue to shoulder its responsibility and play a more positive role in creating a more secure, just and peaceful world for future generations, he said.Before the reception, Dai had a brief meeting with Tokaev, exchanging views on the UN's role as well as China's cooperation within the UN.