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WASHINGTON, May 4 (Xinhua) -- The U.S. National Aeronautics and Space Administration (NASA) announced Wednesday that its Gravity Probe B (GP-B) mission has confirmed two key predictions derived from Albert Einstein's general theory of relativity, which the spacecraft was designed to test.The experiment, launched in 2004, used four ultra-precise gyroscopes to measure the hypothesized geodetic effect, the warping of space and time around a gravitational body, and frame- dragging, the amount a spinning object pulls space and time with it as it rotates.GP-B determined both effects with unprecedented precision by pointing at a single star, IM Pegasi, while in a polar orbit around Earth. If gravity did not affect space and time, GP-B's gyroscopes would point in the same direction forever while in orbit. But in confirmation of Einstein's theories, the gyroscopes experienced measurable, minute changes in the direction of their spin, while Earth's gravity pulled at them.The findings are available online in the journal Physical Review Letters."Imagine the Earth as if it were immersed in honey. As the planet rotates, the honey around it would swirl, and it's the same with space and time," said Francis Everitt, GP-B principal investigator at Stanford University. "GP-B confirmed two of the most profound predictions of Einstein's universe, having far- reaching implications across astrophysics research."GP-B is one of the longest running projects in NASA history, with agency involvement starting in the fall of 1963 with initial funding to develop a relativity gyroscope experiment. Subsequent decades of development led to groundbreaking technologies to control environmental disturbances on spacecraft, such as aerodynamic drag, magnetic fields and thermal variations. The mission's star tracker and gyroscopes were the most precise ever designed and produced.GP-B completed its data collection operations and was decommissioned in December 2010."The mission results will have a long-term impact on the work of theoretical physicists," said Bill Danchi, senior astrophysicist and program scientist at NASA Headquarters in Washington. "Every future challenge to Einstein's theories of general relativity will have to seek more precise measurements than the remarkable work GP-B accomplished."

BEIJING, March 6 (Xinhua) -- China aims to "basically eradicate poverty" by 2020 while greatly raise its poverty line, in order to help more people in need, Chinese Premier Wen Jiabao said here Sunday.The State Council is drafting a new ten-year poverty-reduction plan (2011-2020), in which the current poverty line of 1,196 yuan per year (about 0.5 U.S. dollars a day) will be greatly raised, Wen told a panel meeting of the ongoing session of the National People's Congress (NPC).The nation will intensify its poverty alleviation efforts through aids and development, focusing on large areas of destitute population, he said to a group of NPC deputies from Gansu, one of the poorest regions in China.According to the United Nations' standard of one dollar per person each day, China still has 150 million people under the poverty line.Wen said lack of water was the bottleneck for Gansu's social-economic development, urging the province to expand the use of water conservancy technology.Wen also urged the province to coordinate economic development with environmental protection, and reverse environmental degradation in Dunhuang, a historical city with world cultural heritage threatened by decertification.

NEW DELHI, March 5 (Xinhua) -- Doctors in India have claimed to have successfully performed a rare robotic heart surgery on a 23- year-old person at a hospital in the southern Indian city of Chennai, local media reported Saturday.Dr. R. Ravi Kumar, the Director of the Institute of Cardiovascular Disease at the Chettinad Health City, said the robotically assisted procedure involved replacing both the mitral and the aortal valve simultaneously.The surgery carried out on D. Vijayakanth, an auto driver from Vellore, was done by a three armed robot, took four hours and cost 225,000 rupees (4,500 U.S. dollars)."The best part about using a robot in cardiac surgery is that the patient's heart need not be opened and the surgery can be done using a small 4cm incision. This is not possible with normal surgeries without a robot," Dr Ravi Kumar was quoted by local daily The Times of India as saying.Robotic surgery, which is fairly new in the country, can be used for a gamut of medical procedures, said Dr Ravi Kumar."It requires a lot of precision and intense training because though the robotic hands do the surgery, it has to be controlled by a trained surgeon. One of the biggest disadvantages is the lack of sensory perception which is there when the surgeon actually does the surgery himself," he said.

BEIJING, Feb. 5 (Xinhua) -- China's meteorological authority said Saturday that a cold snap would sweep north China over the next few days, bringing down temperatures and carrying gusty winds.Temperatures in some parts of Xinjiang Uygur Autonomous Region, Inner Mongolia Autonomous Region and northeast China will drop 4 to 6 degrees Celsius over the weekend, the National Meteorological Center (NMC) said in a statement on its website.In most areas north to the Huaihe River, the temperatures will go down 4 to 6 degrees Celsius, or even 8 to 10 degrees Celsius in some parts of the areas between Monday and Tuesday.The cold front would then move southward to affect more areas in the eastern and southern parts of the country.The NMC said some areas in northern and western Xinjiang Uygur Autonomous Region, the eastern part of Inner Mongolia, Sichuan Basin and most of the northeast China, the western parts of the areas south to the Yangtze River will see light to moderate snow or sleet in the forthcoming three days.Fog continued to shroud south China Saturday, reducing visibility to less than 200 meters in parts of Hunan, Hubei, Jiangxi, Sichuan and Fujian provinces, as well as Chongqing City.

BEIJING, Jan. 21 (Xinhua) -- China's State Council, or Cabinet, Friday published the newly adopted regulations on expropriation of houses on state-owned land and compensation.The new rules, which took effect upon the issuing, took the place of the 2001 regulations on administration of the housing demolition and relocation in cities.The new rules specifically stated that neither violence or coercion may be used to force homeowners to leave. Nor could measures, such as illegally cutting water and power supplies, be used in relocation work.The new rules also banned land developers' involvement in the demolition and relocation procedures, as well as demolition by local governments without court approval.Moreover, the new regulations ensured fair prices for homeowners by providing that compensation for expropriated homes should be no lower than the sum of the market price of similar properties at the time of an expropriation.The regulations were first reviewed at a State Council executive meeting in December 2007. Later, public opinion was twice sought in 2010 after revisions had been made to the regulations.An executive meeting of the State Council Wednesday gave in-principle approval to the regulations.