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BEIJING, Oct. 26 (Xinhuanet) -- The question, why the first documented supernova was super-sized and grew so fast, has puzzled astronomers for centuries. Now it is solved by US researchers.The supernova, an exploded star, was observed in 185 A.D. and documented as a mysterious "guest star" by Chinese astronomers. It was visible for eight months.Scientists later found the supernova, 8,000 light years away, was a bigger-than-expected supernova remnant. BBC reported that if the infrared light it emits could be seen by human eyes, it would appear to be as large as the full Moon in the sky.Through observations in space telescopes, researchers of a latest study revealed that the explosion took place in a cavity in space, which allowed the star's remains to travel out much faster and farther. The study was published online in the Astrophysical Journal Monday.The supernova was "two to three times bigger than we would expect for a supernova that was witnessed exploding nearly 2,000 years ago. Now, we've been able to finally pinpoint the cause," stated Brian Williams, lead author of the study and an astronomer at North Carolina State University in Raleigh.

BAGHDAD, Nov. 15 (Xinhua) -- Iraqi President Jalal Talabani told the newly-arrived Chinese ambassador Tuesday that Iraq is willing to expand cooperation and strengthen ties with China.Talabani made the statement when receiving the credential from Ni Jian, China's new ambassador to Iraq, in his presidential palace.The friendship between Iraq and China can be traced back to more than a millennium ago and endured the test of time, Talabani said.The recent years have seen increasing cooperation and exchanges between the two countries in multiple fields, bearing positive results and breakthroughs, he said.Ni Jian said that China attaches great importance to the Chinese-Iraqi relations and is willing to broaden friendly ties with Iraq on the basis of equality and mutual benefit.

BEIJING, Oct. 28 (Xinhuanet) -- Taking aspirin everyday may lower the risk of developing colon cancer for people with the cancer-causing genes, researchers found.The finding was published on Friday in the British medical journal "Lancet".The researchers followed 508 patients with Lynch syndrome, an inherited disorder which increases the risk of developing colon and other cancers.These patients were divided into two groups: members in one group took 600 mg aspirins everyday; another group took only the dummy pills.After 4 years, 10 colon cancer cases were reported among 258 patients who took daily aspirins for at least two years, comparing with 23 cases among 250 patients on dummy pills."This is good news for a very specific population," said Asad Umar, a cancer prevention expert at the U.S. National Cancer Institute.However, the finding doesn't apply to the general public, suggested the lead author of the study John Burn, a geneticist at Newcastle University in England.Only those who are at risk of such diseases should consider taking aspirin regularly, such as people having a family history of colon cancer, he added.

SAN FRANCISCO, Nov. 21 (Xinhua) -- Hewlett-Packard Co. (HP) on Monday reported that its profit in the most recent quarter fell more than 90 percent with sales also declining.In the company's fourth quarter of fiscal 2011 ended Oct. 31, the company posted net earnings of 239 million U.S. dollars, compared with 2.54 billion dollars in the same period a year earlier.HP's net revenue for the quarter reached 32.1 billion dollars, down 3 percent year-on-year.Excluding one-time items, HP earned 1.17 dollars per share, which topped estimates of analysts.According to Thomson Reuters, analysts had expected earnings of 1.13 dollars per share on revenue of 32.05 billion dollars.It was the first earnings report since Meg Whitman took over as chief executive officer (CEO) of the information technology giant on Sept. 22, replacing Leo Apotheker."HP has a great opportunity to build on our strong hardware, software, and services franchises with leading market positions, customer relationships, and intellectual property," Whitman said in a statement after the earnings announcement."We need to get back to the business fundamentals in fiscal 2012, including making prudent investments in the business and driving more consistent execution," she added.

WASHINGTON, Nov. 24 (Xinhua) -- A new study suggests that the rate of global warming from doubling of atmospheric carbon dioxide may be less than the most dire estimates of some previous studies.Authors of the study, which was funded by the National Science Foundation and published online on Thursday in the journal Science, say that global warming is real and that increases in atmospheric CO2 will have multiple serious impacts. However, the most Draconian projections of temperature increases from the doubling of CO2 are unlikely."Many previous climate sensitivity studies have looked at the past only from 1850 through today, and not fully integrated paleoclimate date, especially on a global scale," said Andreas Schmittner, an Oregon State University researcher and lead author on the Science article. "When you reconstruct sea and land surface temperatures from the peak of the last Ice Age 21,000 years ago -- which is referred to as the Last Glacial Maximum -- and compare it with climate model simulations of that period, you get a much different picture.""If these paleoclimatic constraints apply to the future, as predicted by our model, the results imply less probability of extreme climatic change than previously thought," Schmittner added.Scientists have struggled for years trying to quantify "climate sensitivity" -- which is how the Earth will respond to projected increases of atmospheric carbon dioxide. The 2007 IPCC report estimated that the air near the surface of the Earth would warm on average by two to 4.5 degrees (Celsius) with a doubling of atmospheric CO2 from preindustrial standards. The mean, or " expected value" increase in the IPCC estimates was 3.0 degrees; most climate model studies use the doubling of CO2 as a basic index.The researchers based their study on ice age land and ocean surface temperature obtained by examining ices cores, bore holes, seafloor sediments and other factors. When they first looked at the paleoclimatic data, the researchers only found very small differences in ocean temperatures then compared to now."Our study implies that we still have time to prevent that from happening, if we make a concerted effort to change course soon," said Schmittner.

来源：资阳报