The British-made Beagle 2 spacecraft is on the last leg of its six month journey to Mars, scientists say.
On Monday, it changed direction to put it on a direct route to the Red Planet.
Until then, it had been aimed slightly away from Mars. That meant it wouldn't smash into the planet and harm it if anything went wrong.
But everything's been running smoothly and Beagle 2 is set to touch down on Christmas Day, when it will start looking for signs of Martian life.