After 10 years in space, the Rosetta spacecraft is set to attempt its biggest accomplishment yet.

A 4-billion-mile journey is expected to end Wednesday when the European Space Agency's spacecraft will finally catch up with the 67P/Churyumov-Gerasimenko comet, according to SPACE.com. If successful, it will be the first time any spacecraft has orbited a comet, the report added.

In November, Rosetta will drop a small lander known as Philae onto the comet, the Christian Science Monitor reports.Philae will be used to perform studies and conduct experiments, the report adds, and Rosetta will continue to track the comet as it speeds around the sun.

Pictured is comet 67P/C-G, as seen by the Rosetta spacecraft.

(European Space Agency)

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Matching Rosetta's speed with the comet's velocity required 10 orbit-correction maneuvers, according to the ESA. These speed-reduction burns began in May, and there will be one more short recalibration on Wednesday to prepare the spacecraft for its orbit.

Even before Rosetta gets within striking distance of the comet, the spacecraft is already sending back interesting data. On Sunday, from a distance of 186 miles, its navigation camera snapped an image of the comet that was the clearest view scientists have ever seen of 67P/C-G, according to a Yahoo.com report.

Rosetta also took the comet's temperature and found it's too hot to be completely covered in ice, but ESA scientists believe there are still patches of ice on the surface of 67P/C-G, the report adds.

Rosetta launched on March 2, 2004, according to SPACE.com.

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