This spacecraft is a comet explorer. It has the tools to do a lot more.

We've flown through the worst of it and we're still in contact with our spacecraft.

We took a spacecraft and flew it five years. But in these five years, we went back to the origin of time - to the origin of our solar system.

We are totally prepared, both for if everything goes perfectly and if the spacecraft acts up a little bit.

The spacecraft has to be smart enough on its own to observe the comet, determine whether it's headed in the right direction, if not, make its own course correction, and then fire its thrusters to achieve that course correction.

This thing went like clockwork. To see that thing in one piece on the floor of the desert is very moving.