The European Space Agency’s Rosetta mission has successfully landed the Philae probe on a comet. It took 10 years for the Rosetta spacecraft to reach Comet 67P/Churyumov–Gerasimenko. Where it established an orbit and deployed a probe.
The Rosetta spacecraft had been surveying the comet since August, trying to determine a suitable landing site for Philae. During that period, Rosetta recorded the mysterious “Comet Song” heard in the following clip.