The Mars Science Laboratory (MSL), currently flying through space, has been corrected so it lands on the planet Mars in August.
It was launched in November on a rocket from America, but wasn't travelling in exactly the right direction.
In a three-hour process, it was put on course by firing up eight thrusters.
The total journey from Earth is a staggering 570-million kilometers. That's er... as far as...er.. here to Mars, obviously!
It will have to be corrected again before it can land, but scientists say this is normal for a space flight to Mars.
Eventually the MSL should touch down inside a 150km-wide crater - if that was on Earth it would take two hours just to travel across it.
The roving lab is aiming to land inside a 150km-wide bowl called Gale Crater.
It will use its complex equipment to work out if the planet has ever had conditions which can support life.
Pictures from European Space Agency