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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, Nov. 28 (Xinhuanet) -- A majority of the emergency hospitalizations for bad events related to medication use in old U.S. adults stem from four common medications, according to a new study in the New England Journal of Medicine Monday.The study was conducted by researchers from the Centers for Disease Control and Prevention of U.S.There are nearly 100,000 emergency hospitalizations for adverse drug events in older Americans, says researcher Daniel S. Budnitz, MD, MPH, director of the CDC's Medication Safety Program.And the four types of medication -- two for diabetes and two blood-thinning agents -- account for two-thirds of those drug-related emergency hospitalizations. They most often cited: warfarin (Coumadin, Jantoven); insulin; antiplatelet drugs such as aspirin and clopidogrel (Plavix); oral hypoglycemic agents."Both blood thinners and diabetes medicines are critical drugs that can be lifesaving," Budnitz says.However, he says that ''these are medications that you do need to pay attention to," being sure the dose and timing are correct, among other measures.

MOSCOW, Nov. 25 (Xinhua) -- Russia's Proton-M carrier rocket was launched on Friday from the Baikonur space center in Kazakhstan with a Chinese communications satellite "AsiaSat-7", according to Russia's Federal Space Agency Roscosmos.Roscosmos' live broadcast on its official website showed that the Proton-M rocket atop the Briz-M upper stage was launched at 23: 10 Moscow time (1910 GMT). The separation of the satellite from the rocket was scheduled for 08:23 Moscow time (0423 GMT) on Saturday.The AsiaSat-7 which belongs to the Asia Satellite Telecommunications Company Limited (AsiaSat) located in Hong Kong, China, is a new generation satellite designed to replace AsiaSat 3S at the orbital location of 105.5 degrees East.The new satellite was expected to support a broad range of applications for the Asia-Pacific region, including television broadcast and VSAT (Very Small Aperture Terminal) networks.

SHANGHAI, Jan. 11 (Xinhua) -- China has allowed the Bank of East Asia (BEA) to issue yuan-denominated bonds in Hong Kong for a second time, about three years after it became the first foreign-invested bank to make a yuan bond issuance, the bank said Wednesday.BEA China Ltd, a wholly-owned subsidiary of the BEA, was given the approval by the National Development and Reform Commission of China to issue yuan bonds in Hong Kong, it said.Details on the amounts and timing of the offerings weren't available. In 2009, in a major landmark, the BEA issued its first yuan bonds in Hong Kong in an aggregate principal amount of 4 billion yuan (630 million U.S. dollars).The BEA was among the first foreign-invested banks to be given the green light to issue yuan-denominated bonds in Hong Kong, a move analysts say will bolster the international influence of the Chinese currency, also known as renminbi.Sun Minjie, deputy head of BEA China, said the second bond issuance will give the bank stable access to capital, improve its debt portfolio, and support its development on the Chinese mainland.

BEIJING, Jan. 7 (Xinhua) -- China's land supply went up 37 percent year-on-year in 2011 amid the government's tightening measure on commercial property market, according to the Ministry of Land and Resources (MLR) on Saturday. Most of the land supply last year went to the country's 10 million government-subsidized affordable housing units that began construction in 2011, according to MLR.In the meantime, land supply for commercial residential housing totaled about 96,700 hectares last year, up only 4 percent from previous year.Planned land supply quota for construction last year were up 16.25 percent year-on-year from 180,000 hectares in 2010.