Tomorrow morning, a European space probe will arrive at a comet with a tongue-twister of a name: Churyumov-Gerasimenko.
Getting there has been proven even trickier than pronouncing it.
The Rosetta spacecraft began its journey way back in March of 2004.
First it swung past Earth to gather speed. Then it catapulted out to Mars, for a boost from that planet's gravity field. Then in 2007, it came back to Earth for another push — then back out to an asteroid, and back to Earth.