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LOS ANGELES, May 12 (Xinhua) -- A subsurface ocean of molten or partially molten magma exists beneath the surface of Jupiter's volcanic moon Io, the Jet Propulsion Laboratory (JPL) said on Thursday."The finding heralds the first direct confirmation of this kind of magma layer at Io and explains why the moon is the most volcanic object known in the solar system," JPL said in a press release posted on its website.The finding was based on new data analysis from NASA's Galileo spacecraft, said JPL.The research was conducted by scientists at the University of California, Los Angeles; the University of California, Santa Cruz;, and the University of Michigan, Ann Arbor. The study is published this week in the journal Science, JPL said."Scientists are excited we finally understand where Io's magma is coming from and have an explanation for some of the mysterious signatures we saw in some of the Galileo's magnetic field data," said Krishan Khurana, lead author of the study and former co- investigator on Galileo's magnetometer team at UCLA."It turns out Io was continually giving off a 'sounding signal' in Jupiter's rotating magnetic field that matched what would be expected from molten or partially molten rocks deep beneath the surface."Io produces about 100 times more lava each year than all the volcanoes on Earth, according to data released by JPL in Pasadena, Los Angeles.While Earth's volcanoes occur in localized hotspots like the "Ring of Fire" around the Pacific Ocean, Io's volcanoes are distributed all over its surface, JPL said, adding that a global magma ocean about 30 to 50 km beneath Io's crust helps explain the moon's activity."It has been suggested that both the Earth and its moon may have had similar magma oceans billions of years ago at the time of their formation, but they have long since cooled," said Torrence Johnson, a former Galileo project scientist based at JPL, an affiliation with NASA."Io's volcanism informs us how volcanoes work and provides a window in time to styles of volcanic activity that may have occurred on the Earth and moon during their earliest history," said Johnson, who was not directly involved in the study.NASA's Voyager spacecraft discovered Io's volcanoes in 1979, making that moon the only body in the solar system other than Earth known to have active magma volcanoes. The energy for the volcanic activity comes from the squeezing and stretching of the moon by Jupiter's gravity as Io orbits the largest planet in the solar system.Galileo was launched in 1989 and began orbiting Jupiter in 1995. Unexplained signatures appeared in magnetic field data from Galileo flybys of Io in October 1999 and February 2000. After a successful mission, the spacecraft was intentionally sent into Jupiter's atmosphere in 2003.

BEIJING, March 8 (Xinhuanet) -- U.S. Food and Drug Administration (FDA) announced there was no new reason for safety concern in Pfizer Inc's Prevenar and Sanofi Aventis SA's ActHIBor vaccines, according to media reports Tuesday.Health agencies "have not detected new safety concerns or unusual reporting patterns" in the vaccines, which are used to prevent forms of meningitis and pneumonia, FDA spokeswoman Shelly Burgess said in an emailed statement.Health agencies in the United States will continue to monitor the vaccines for safety, the spokeswoman added.The Japanese health ministry had decided to suspend the vaccines after four unexplained deaths were reported. The causes of the deaths are still investigated, the Japanese ministry said in a release on its website.

BEIJING, May 20 (Xinhuanet) -- Scientists have discovered a Jupiter-sized exoplanet that is completely unbound from a host star, according the scientific journal "Nature" published Thursday.The research was conducted by astrophysicists from Osaka University in Japan.Using the technique called "gravitational microlensing", scientists turned their telescopes towards the centre of the Milky Way and detected this "lonely planet" moving in a extremely large orbit, which suggested it does not connect to any solar system.Then they estimated the total number of such wondering planets could be as many as 400 billion, based on the detection efficiency. This number far outnumbers the main-sequence stars such as our Sun."This is an amazing result, and if it is right, the implications for planet formation are profound," says astronomer Debra Fischer at Yale University in New Haven, Connecticut.And scientist began to consider the possibility that liquid water could exist on this kind of unbound planets. "That might be an attractive possibility for life," said David Stevenson, a planetary scientist at the California Institute of Technology.

BEIJING, May 22 (Xinhua) -- Chinese Premier Wen Jiabao's just concluded trip to Japan, during which he attended the fourth China-Japan-South Korea summit, has significantly boosted tripartite cooperation and regional peace and stability, Chinese Foreign Minister Yang Jiechi said Sunday.Yang, who accompanied Wen during his visit on Saturday and Sunday, told reporters that the two-day trip has further boosted cooperation in East Asia, consolidated popular support for China-Japan friendship, enriched the contents of China-Japan and China-South Korea partnerships, and is of great and profound significance for maintaining regional peace, stability and prosperity.Yang said the trip was practical, effective, productive and a complete success.DEEPENING TRILATERAL COOPERATIONThe trip has deepened trilateral practical cooperation in various fields, Yang said.Wen, at the trilateral summit held in Tokyo on Sunday and attended by Japanese Prime Minister Naoto Kan and South Korean President Lee Myung-bak, put forward a seven-point proposal for the three countries to widen cooperation.First, efforts should be made to support Japan's post-quake reconstruction.Second, the three countries should attach great importance to nuclear safety and strictly implement the consensus reached.Third, the three countries should promote practical cooperation on disaster prevention and reduction.Fourth, they should promote liberalization and facilitation of trade and investment among them, push forward integration of regional economy, and try to start negotiations on a tripartite free trade zone next year.Fifth, they should vigorously develop renewable energy and popularize energy-saving technology.Sixth, they should speed up construction of demonstration bases for circular economy in order to promote rational use of resources, protect the environment and realize sustainable development.Seventh, they should boost people-to-people and cultural exchanges.Premier Wen's proposal was applauded by Japanese Prime Minister Kan and South Korean President Lee.The three leaders, in a joint declaration issued after the summit, said they would deepen the future-oriented comprehensive cooperative partnership among the three countries.They also agreed to cooperate on disaster management, nuclear safety, economic growth, sustainable development and cultural affairs.

BEIJING, March 22 (Xinhuanet) -- An autopsy began Monday on Berlin zoo's superstar polar bear Knut who died suddenly on Saturday, media reports said.However, it remained unclear when the results from the post-mortem examination of Knut would be published."I cannot give you a timeline. We will inform the public when we know what the exact cause was," AFP quoted spokeswoman Claudia Bienek as saying.Knut died while sunbathing at Berlin zoo in Germany in front of visitors. The four-year-old swivelled around several times before falling backwards into the water in his enclosure.Witnesses said he suffered a series of convulsions and appeared to have had an epileptic fit or a heart attack.Knut was born in 2006 to a female bear who rejected him at birth. He was hand-raised by his keeper at the zoo. Films were made about him and he appeared on the front cover of Vanity Fair magazine and earned the zoo about 7.11 million U.S. dollars.More than 15,000 Knut fans have so far paid tribute to him on Berlin zoo's website. Hundreds more have flocked to the zoo in person to lay flowers at his enclosure.