Experts from the European Space Agency (ESA) say they plan on using the Moon’s gravity, and then Earth’s, as a natural brake – slowing itself down before firing it on to the next phase of its journey.
By doing so, the move will change Juice’s speed and direction to alter its course through space.
However, the slightest mistake could take the spacecraft off course – which could result in the end of the mission.
Dr Caroline Harper, from the UK Space Agency, said: “This is a world first – a double fly-by of the Moon and Earth has never been done before.”
“This saves a huge amount of fuel, which means that when Juice arrives at its destination it can do a lot more science,” she explained.
Two cameras on board Juice will also be taking photos throughout the lunar-Earth flyby – which the ESA say they will share publicly when they receive them.