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WASHINGTON, July 27 (Xinhua) -- Astronomers studying observations taken by NASA's Wide-field Infrared Survey Explorer (WISE) mission have discovered the first known "Trojan" asteroid orbiting the sun along with Earth, the U.S. National Aeronautics and Space Administration (NASA) announced Wednesday in a statement.Trojans are asteroids that share an orbit with a planet near stable points in front of or behind the planet. Because they constantly lead or follow in the same orbit as the planet, they never can collide with it. In our solar system, Trojans also share orbits with Neptune, Mars and Jupiter. Two of Saturn's moons share orbits with Trojans.Scientists had predicted Earth should have Trojans, but they have been difficult to find because they are relatively small and appear near the sun from Earth's point of view."These asteroids dwell mostly in the daylight, making them very hard to see," said Martin Connors of Athabasca University in Canada, lead author of a new paper on the discovery to be published Thursday in the journal Nature. "But we finally found one, because the object has an unusual orbit that takes it farther away from the sun than what is typical for Trojans. WISE was a game-changer, giving us a point of view difficult to have at Earth 's surface."The WISE telescope scanned the entire sky in infrared light from January 2010 to February 2011. Connors and his team began their search for an Earth Trojan using data from NEOWISE, an addition to the WISE mission that focused in part on near-Earth objects, or NEOs, such as asteroids and comets. NEOs are bodies that pass within 28 million miles (45 million kilometers) of Earth 's path around the sun. The NEOWISE project observed more than 155, 000 asteroids in the main belt between Mars and Jupiter, and more than 500 NEOs, discovering 132 that were previously unknown.The team's hunt resulted in two Trojan candidates. One called 2010 TK7 was confirmed as an Earth Trojan after follow-up observations with the Canada-France-Hawaii Telescope on Mauna Kea in Hawaii.The asteroid is roughly 1,000 feet (300 meters) in diameter. It has an unusual orbit that traces a complex motion near a stable point in the plane of Earth's orbit, although the asteroid also moves above and below the plane. The object is about 50 million miles (80 million kilometers) from Earth. The asteroid's orbit is well-defined and for at least the next 100 years, it will not come closer to Earth than 15 million miles (24 million kilometers).

SYDNEY, Aug. 2 (Xinhua) -- Australia's general practitioners ( GPs) will not back the idea of routine prostate cancer tests for men as young as 40 despite growing calls for regular screening, the nation's largest professional general practice organization said on Tuesday.Spokesman for the Royal Australian College of General Practitioners (RACGP), Professor Chris Del Mar said there was not enough solid evidence to suggest major benefits from routine screening and that current tests were unable to detect "nasty" and potentially deadly forms of prostate cancer from ones that will not cause any harm."The problem is you end up treating lots of people who don't need to be treated," Del Mar said, adding that treatment could leave men impotent and with incontinence problems."You will treat 20 times as many people than would have ever been bothered by it. We don't yet know that treating prostate cancer is better than not treating it. We are not sure it does any good and could be doing more harm," he said.On the other hand, Australia's urologists and pathologists both want men aged 40 and over who are worried about developing the disease to be offered tests.The Royal College of Pathologists (RCPA) on Tuesday released an official recommendation on routine screening for men aged 40 and over if they were concerned about prostate cancer.The pathologists argue that blood tests for prostate cancer in men under 50 can predict their future risk of developing the disease by measuring their prostate specific antigen levels (PSA).They say that men with high PSA levels for their age should be tested annually, while those PSA levels are below the average could be tested less frequently.Their call for more routine testing contrasts with recommendations for GPs, whose `Red Book' medical guide does not support regular screening.Instead, it suggests GPs should inform men aged 50-70 of the risks and benefits of screening and only test if the patient requests one.RACGP spokesman Del Mar, who co-wrote the RACGP's recommendations, said while the Red Book was being revised "we are not going to liberalize it".Prostate cancer is one of the most common forms of cancer in Australia.About 20,000 cases of prostate cancer are diagnosed each year, with 3,300 men dying.Given the debate around prostate cancer tests, the Royal College of Pathologists wants to work with GPs, urologists and other medical organizations to develop a consensus on how and when to test for the disease, in a similar way to how experts approach breast cancer."It would be a good outcome for prostate cancer if we worked towards developing more of an umbrella document which reflected consensus among different stakeholder organizations. ," RCPA President Paul McKenzie said.

MOSCOW, June 27 (Xinhua) -- Russia successfully launched a Cosmos class military satellite on Monday, said spokesman of the Russian Space Forces Alexei Zolotukhin.A Soyuz-U carrier rocket carrying the military satellite blasted off from the Plesetsk Plesetsk space center in northern Russia at 20:00 Moscow time (1600 GMT), Zolotukhin said."The rocket put the Cosmos series military satellite into the designated orbit at 20:08 Moscow time (1608 GMT)," he added.The spokesman also said the launch of the Soyuz-U carrier rocket "was the first time for this type of rockets" in this year.The launch carried out by a team from the Russian Space Forces was supervised by Space Forces Commander Oleg Ostapenko.The satellite, Cosmos-2472, is a new member to a Russian network of about 60-70 military reconnaissance satellites.

BEIJING, Sept. 6 (Xinhuanet) -- The amount of space junks floating in Earth's orbit has reached a critical level, warned scientists.The future space missions may become too dangerous to fly for a risk of colliding with space junks, said a report released recently by the U.S. National Research Council (NRC).The kinds of space junks range from huge, the report said, there are thousands of discarded satellites and rocket boosters and countless tiny pieces of daily gabages from space missions.The debris are traveling in orbit at 17,500mph, at such a speed even a tiny clash can destroy a spacecraft.The NRC recommended that NASA should launch a plan to clean up the floating debris and called on other major space nations' cooperation."The current space environment is growing increasingly hazardous to spacecraft and astronauts," said Kessler, an ex-NASA researcher, "NASA needs to determine the best path forward for tackling the multifaceted problems caused by meteoroids and orbital debris that put human and robotic space operations at risk."

UNITED NATIONS, Sept. 19 (Xinhua) -- As the UN on Monday pursued the world's top killer -- non-communicable diseases (NCDs) -- a leading doctor from the World Health Organization (WHO) called for preventative measures on such chronic diseases to be placed higher on the international agenda."It's not a choice of dealing with it or not, it's an absolute fundamental imperative for development," said Dr. Douglas Bettcher, WHO's director for the Tobacco Free Initiative, told Xinhua in a recent telephone interview.With NCDs already claiming 36 million lives a year -- nearly 100,000 people a day -- the UN Geneva-based health agency, WHO warns that deaths from chronic diseases will continue to climb even faster, amounting to 52 million deaths by 2030.As world leaders on Monday kicked off a two-day high-level meeting to enact a roadmap to attack diseases like cancer, diabetes, heart and lung diseases, it is hoped that the summit on NCDs, which is being called a "once in a generation opportunity," moves to become a "worldwide priority," Bettcher said.Marking the second time in its history that the United Nations General Assembly has ever put a global disease on the table, health experts and world leaders from 193 nations met to avert what the UN has declared a "public health emergency in slow motion. ""It's a make it or break it time for moving forward this very important agenda at this time of global financial crisis," said Bettcher.Calling NCDs the top global killer "by a long shot," Bettcher attributed such rises in deaths partly to the aging of the world's population, rapid urbanization and increased exposure to risk factors, particularly in low-and middle-income countries."This is a landmark meeting," said UN Secretary-General Ban Ki- moon at the opening of the unprecedented meeting. "Three out of every five people on earth die from the diseases that we gather here to address."The last time the UN looked at a health issue under the global microscope on such a high-level was almost a decade ago.

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