On Nov. 12, 2014, a European spacecraft named Philae landed on Comet 67P . To say it was a bumpy landing would be an understatement.

The European Space Agency's Philae lander separated from an orbiter called Rosetta ahead of its historic landing in 2014. It was supposed to use harpoons to secure itself on to the surface of Comet 67P, but the harpoons never fired.

When it touched down, it immediately bounced back up into space . The first bounce brought Philae half a mile above the comet's surface before gravity brought it back down.

Philae was missing for almost two years before scientists found it . Images from Rosetta showed Philae stuck in a dark crevice on top of the rubber duck-shaped comet.

The European Space Agency's Rosetta spacecraft captured these photos of the Philae lander descending toward, and then bouncing off, the surface of Comet 67P/Churyumov–Gerasimenko during its historic touchdown on Nov. 12, 2014.…