Thar She Blows!!!

After 10 years of travel in space, Rosetta is now tired of waiting... Waiting with a harpoon to plunge into Comet 67B and make history... Earthlings are enjoying the show...

Rosetta landing is a "GO"! - http://www.cnn.com/2014/11/11/world/comet-landing-countdown/index.html?hpt=hp_c2
More about Rosetta - http://rosetta.jpl.nasa.gov/
Obligatory xkcd - xkcd: Harpoons
What if? Hitting a comet - Hitting a comet