As someone who has enough trouble setting up proper orbits in Kerbal Space Program, it's astounding to me the whole process of multiple gravity assists to get the probe to the right place at the right time at the right velocity.

Also, a little disappointed (though understanding) that the JS is obfuscated (https://util1.estec.esa.int/rosetta/where_is_rosetta/js/tecf...). I was hoping to be able to pull it apart and see how it's visualizing the orbits in three.js.