... Adirondack Rock on Mars . ... Still, its relatively large size and dust-free surface made it the first destination for the robotic Spirit rover currently roving Mars. ... On January 2, the robot spacecraft STARDUST became one of the first to plow through the surrounding cloud of dust and grit to photograph the very heart of a comet. ... Make your background the closest image of Mars yet. The Spirit Rover currently rolling on Mars has taken the highest resolution image to date of another planet. ...