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WASHINGTON, March 25 (Xinhua) -- NASA's Stardust spacecraft depleted fuel and ceased operation on Thursday after a 12-year run, the U.S. space agency said Friday."This is the end of the spacecraft's operations, but really just the beginnings of what this spacecraft's accomplishments will give to planetary science," said Lindley Johnson, Stardust-NExT and Discovery program executive at NASA headquarters in Washington."The treasure-trove of science data and engineering information collected and returned by Stardust is invaluable for planning future deep space planetary missions."Artist's concept of Stardust spacecraft nearing EarthLaunched on Feb. 7, 1999, Stardust flew past the asteroid named Annefrank and traveled halfway to Jupiter to collect the particle samples from the comet Wild 2. The spacecraft returned to Earth's vicinity to drop off a sample return capsule eagerly awaited by comet scientists.NASA re-tasked the spacecraft as Stardust-NExT to perform a bonus mission and fly past comet Tempel 1, which was struck by the Deep Impact mission in 2005. The mission collected images and other scientific data to compare with images of that comet collected by the Deep Impact.The Stardust-NExT met all mission goals, and the spacecraft was extremely successful during both missions. From launch until final rocket engine burn, it travelled approximately 3.54 billion miles.After the mileage logged in space, the Stardust team knew the end was near for the spacecraft. With its fuel tank empty and final radio transmission concluded, the most traveled comet hunter will move from NASA's active mission roster to retired."This kind of feels like the end of one of those old western movies where you watch the hero ride his horse toward the distant setting sun -- and then the credits begin to roll," said Stardust-NExT project manager Tim Larson from NASA's Jet Propulsion Laboratory in Pasadena, California. "Only there's no setting sun in space."

LOS ANGELES, April 8 (Xinhua) -- NASA's Wide-field Infrared Survey Explorer (WISE) has discovered a rare asteroid that traces out a horseshoe shape relative to Earth, the Jet Propulsion Laboratory (JPL) said on Friday.Unlike most near-Earth asteroids (NEAs) that have eccentric, or egg-shaped, orbits that take the asteroids right through the inner solar system, the new object has an orbit that is almost circular such that it cannot come close to any other planet in the solar system except Earth, JPL said.However, even though the asteroid rides around with Earth, it never gets that close, said JPL in Pasadena, Los Angeles.As the asteroid approaches Earth, the planet's gravity causes the object to shift back into a larger orbit that takes longer to go around the sun than Earth. Alternately, as Earth catches up with the asteroid, the planet's gravity causes it to fall into a closer orbit that takes less time to go around the sun than Earth, according to JPL.The asteroid therefore never completely passes our planet. This slingshot-like effect results in a horseshoe-shaped path as seen from Earth, in which the new object, designated 2010 SO16, takes 175 years to get from one end of the horseshoe to the other, JPL said."The origins of this object could prove to be very interesting, " said Amy Mainzer of JPL, the principal investigator of NEOWISE, which is the asteroid- and comet-hunting portion of the WISE survey mission. "We are really excited that the astronomy community is already finding treasures in the NEOWISE data that have been released so far."JPL manages and operates the WISE for NASA's Science Mission Directorate, Washington.

MOSCOW, Jan. 25 (Xinhua) -- China condemned the terrorist attack at Moscow's Domodedovo Airport that killed 35 on Monday, visiting Chinese State Councilor Dai Bingguo said on Tuesday."We have learned that a terrorist attack occurred at the Domodedovo Airport yesterday. We are simply shocked by this news. We condemn this terrorist attack," Dai said when meeting with Russian Foreign Minister Sergei Lavrov.During their meeting, Dai and Lavrov exchanged opinions on bilateral ties, regional situation and issues concerning the Shanghai Cooperation Organization and others.Dai met with Russian President Dmitry Medvedev and participated in the fifth round strategic security talks with Russian Security Council Secretary Nikolai Patrushev on Monday.

BEIJING, Feb. 8 (Xinhua) -- As the Chinese Lunar New Year hoilday ended Tuesday, waves of Chinese residents began their journey back to work, as they boarded trains, airplanes and buses.The China Meteorological Administration announced Tuesday that a cold front would cause temperatures to fall by 4 to 12 degrees Celsius in most parts of the country, while some areas in the northwest, north and southwest will see rainfall or snow from Wednesday to Friday.Fleets of motorbikes carrying thousands of migrant workers passed through national roads again on Tuesday.The Ministry of Public Security said it set up 8,300 service stations along the country's major highways to provide free food, medicine, and rest stops for motor-riding migrant workers. The stations also sent police cars to clear the way for large groups of motorists.Chen Tianchong, a migrant worker from Muge County, Guigang City of southwest China' s Guangxi Zhuang Autonomous Region and 38 of his fellow migrant worker started their journey on motorcycles at 4:30 a.m. on the foggy National Road 324, which is a 2,712-kilometer road linking five provinces of Fujian, Guangdong, Guangxi, Guizhou and Yunan in southern China.A motorcycle usually carried two people, often a couple, sometimes with a child sandwiched in between. They would wrap themselves in thick outerwear to battle the cold weather at night. Limited access to cheap public transportation had forced many migrant workers to make their trips home on their own."I promised my boss that I would go back to the factory in Guangdong before Wednesday," said Chen.Chen said that they might arrive at Dali County, Shunde City of south China's Guangdong Province around eleven at night, after more than 18 hours riding a motorcycle from their hometown. By this way, each family may save more than 1,000 yuan - half of their monthly income.Zhong Fei, another migrant worker also from Guangxi, chose this way home during the Spring Festival for the past three years. Zhong told Xinhua that earning money for his family was the most important thing and the exhausting trip was nothing.From Guangdong alone, one of China's manufacturing bases, over 100,000 migrant workers left for home on motorbikes, said the local police. The Spring Festival travel rush started in China in the late 1980s, when millions of farmers from inland China moved to coastal cities to work.In spite the increasing popularity of motor cycles, the majority of Chinese travelers still prefer trains or buses. Shandong province embraced the post-holiday passenger rush Tuesday, with railway stations witnessing 200,000 passengers in a single day.Highway toll booths near Beijing, Shanghai, Tianjin and other big cities in China have become clogged.Passengers are also snapping up airplane tickets. China Southern Airlines had increased flights from 30 to 70 flights per day.Official forecasts indicate that this year's Spring Festival holiday may see a record 2.85 billion passenger trips nationwide, as Chinese workers return home from across the country for family reunions and go back to work after the holidays.

You can think of NASA's Discovery program as a sort of outer-space American Idol: every few years the agency invites scientists to propose unmanned planetary missions. The projects have to address some sort of fundamental science question, and (this is the tough part) they have to be relatively cheap to pull off — say, half a billion dollars or so. Then the proposals go through a grueling competition before judges who aren't as nasty as Simon Cowell but who are every bit as tough. The one left standing at the end gets the equivalent of a recording contract: NASA supplies the funding and the launch vehicle, and away the winner goes — to orbit Mercury, as the Messenger spacecraft is doing right now; or to rendezvous with a couple of asteroids, as the Dawn mission will start doing this July; or to smash into a comet on purpose, a feat achieved by Deep Impact in 2005, a mission not to be confused with the movie of the same name. Now it's time for the next contenders. NASA has just announced that the first round of the latest Discovery competition is over, with three entries out of 28 moving on to the finals. They are, in increasing distance from Earth: the Geophysical Monitoring Station (GEMS) lander, which would use seismometers to study the interior of Mars; the Comet Hopper, which would do just that, leaping from place to place across the surface of Comet 46P/Wirtanen to see how different parts of the tumbling body react to heating by the sun; and the Titan Mare Explorer (TiME), which would plop into a sea of liquid hydrocarbons on Saturn's moon Titan — the first oceangoing vessel ever to set sail on another world. If you had to come up with a theme that ties all three missions together, it would be "origins." The Titan explorer, for example, will be studying a place that — in a crude way, at least — resembles the early planet Earth at a time when life arose here. Titan, with a thick atmosphere and a bizarro-world form of weather featuring toxic winds and hydrocarbon rain, is home to a mix of complex chemistry, complete with organic molecules. The oceans provide a medium in which the molecules can move around and interact with each other. It's even conceivable, though clearly a long shot, that some form of microscopic life already exists on this frigid moon. The Mars lander, by contrast, would visit a place where the seas — plain water in this case — vanished long ago. But the mission of GEMS goes far deeper than that. By analyzing Marsquakes on the Red Planet, GEMS will try to get a handle on what the interior of Mars is like. Scientists don't currently know whether the planet's core is liquid, like Earth's, or solid, or some mushy consistency in between. It all depends on how efficiently Mars has cooled since it formed 4.5 billion years ago, and that depends in turn on the planet's internal structure. "That's the mission," says Bruce Banerdt, of NASA's Jet Propulsion Laboratory, the lead scientist for GEMS. "We want to understand how Mars was built." Along with sensitive seismographic equipment, GEMS will drill down about 20 ft. (6 m) with a thermometer-equipped probe, trying to figure out how quickly the temperature rises with depth. "That will let us extrapolate all the way down to the center," Banerdt says, "which will tell us how fast Mars is cooling."