An unmanned European cargo ship the size of a double-decker bus undocked from the International Space Station Friday, ending a six-month delivery flight to the orbiting lab.

The robotic Automated Transfer Vehicle 3 (ATV-3), with its four X-wing-like solar arrays unfurled, cast off from the space station Friday as the two spacecraft sailed 255 miles (410 kilometers) over western Kazakhstan in Asia. The cargo ship's undocking occurred at 5:44 p.m. EDT (2144 GMT).

The space departure occurred three days later than planned due to delays, first by a computer glitch and later by space junk near the space station.

Space news from NBCNews.com

Science editor Alan Boyle's blog: NASA's Cassini sends back a big, beautiful, black-and-white picture of Saturn and its rings but what's the little white speck in the corner?

But Friday, the ATV-3 spacecraft, which is named the Edoardo Almadi after the famed late Italian physicist of the same name, made a flawless departure from the station. It will spend the next few days orbiting Earth before being intentionally destroyed on Tuesday by burning up in Earth's atmosphereover the Pacific Ocean. [Photos: Europe's Robotic ATV Spaceships]

"Today, everything has worked to perfection," NASA spokesman Rob Navias said during the agency's live broadcast of the undocking.

The ATV-3 spacecraft was built by the European Space Agency and delivered 7.2 tons of food, water and other vital supplies to astronauts aboard the International Space Station when it launched in March from a South American spaceport in Kourou, French Guiana. The ATV-3 spent 184 linked to the space station before being packed with trash and other unneeded items for its eventual fiery demise in Earth's atmosphere.

The ATV-3 is ESA's third unmanned cargo ship mission to visit the space station, which is also supplied by robotic cargo ships from Japan and Russia. In the United States, NASA has contracted two companies SpaceX of Hawthorne, Calif., and Virginia-based Orbital Sciences Corp. to provide unmanned cargo delivery flights to the station. The first official flight by SpaceX is scheduled to launch on Oct. 7, when the company

The ATV craft are huge cylinders 32 feet long (10 meters) and nearly 15 feet wide (4.5 m) and may be visible by observers on Earth as a bright moving light in the night sky, weather permitting. The ATV-3, like the International Space Station, can be spotted if you know where to look.

Go here to see the original:

Huge cargo ship undocks from space station