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© DigitalGlobe/Associated PressThis satellite image provided by the the DigitalGlobe Analysis Center shows the Chinese aircraft carrier Shi Lang (Varyag) sailing in the Yellow Sea. The picture was acquired Dec. 8 by DigitalGlobe's QuickBird satellite.
A commercial satellite operator says it has captured a rare image of China's first aircraft carrier as it sailed through the Yellow Sea, after going through an exercise that's the 21st-century equivalent of finding a needle in a haystack.

DigitalGlobe said the aircraft carrier showed up on a cloud-filled picture snapped on Dec. 8 by its polar-orbiting QuickBird satellite from a height of 280 miles (450 kilometers). An analyst spotted the ship while checking the image on Tuesday, the company said.

Experts have been hoping for a glimpse of China's aircraft carrier at sea. The former Soviet Union started building the ship, originally known as the Varyag, but never finished it. After the Soviet breakup, the Varyag ended up in the hands of the Ukrainian government. The ship was auctioned off to the Chinese in 1998, and since then the Varyag, rechristened the Shi Lang, has been under refurbishment for sea service. DigitalGlobe said this picture was taken during the carrier's second sea trial, approximately 62 miles (100 kilometers) south-southeast of the port of Dalian.

China says the Shi Lang will be used for research and training, and the project is thought to be part of the country's strategy to expand its presence as a naval power. The Chinese military is expected to build more copies of the ship in coming years. In fact, sources told Reuters in July that a second aircraft carrier was under construction.

"China's next moves have to be watched carefully, or there eventually could be a negative impact on maritime safety in Asia," Yoshihiko Yamada, a professor at Japan's Tokai University, told Reuters at the time.