Here's why this is significant:
* Plane of the Ecliptic: This is the imaginary plane containing the Earth's orbit around the Sun. Most planets in our solar system orbit fairly close to this plane.
* Orbital Inclination: This is the angle between a planet's orbital plane and the plane of the ecliptic.
* Mercury's Tilt: Mercury's orbit is tilted at a relatively steep angle, meaning it doesn't quite follow the same path as the other planets.
While Mercury has the most inclined orbit, it's worth noting that all the planets have some degree of orbital inclination.