Humanity has landed spacecraft on the Moon and Mars but until yesterday, we had not landed anything on a small moving object. In our continuing pursuit of knowledge from beyond this world, the European Space Agency completed the hard part of a 10-plus year mission to land a spacecraft on a comet.

At just past 11:00 AM EST on Wednesday, the Rosetta space craft’s Philae lander touched down on Comet 67P.

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