Rosetta and its lander module, known as Philae, made major headlines in November when Philae touched down on the surface of the speeding comet.
The landing was rougher than expected as Philae bounced off the unforgiving surface of the comet, known as 67P/Churyumov-Gerasimenko, and came to rest on its side, quite a distance from its target.
"Philae's landing was an amazing feat and got the world's attention," said Tim Appenzeller, news editor of the journal Science.
"But the whole Rosetta mission is the breakthrough. It is giving scientists a ringside seat as a comet warms up, breathes, and evolves," he added.
This annual list of ground-breaking scientific achievements also includes ground-breaking advances in medicine, robotics, synthetic biology and paleontology, to name a few.
"Breakthroughs should do one of two things: Either solve a problem that people have been wrestling with for a long time or open the door to a lot of new research," added Robert Coontz, deputy news editor at Science.
Here is the journal's list of nine other major scientific achievements of 2014, in no particular order
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