Pluto
Pluto
Uranus.
Uranus is the planet most tipped to its orbital plane, with an axial tilt of about 98 degrees. This extreme tilt causes Uranus to essentially roll on its side as it orbits the Sun, leading to unique seasonal patterns on the planet.
Uranus.
Pluto is considered a dwarf planet and its orbit is more inclined compared to the eight traditional planets in our solar system. This means that Pluto does not lie in the same orbital plane as the other planets.
The orbital inclination of Neptune is approximately 1.77 degrees relative to the plane of the ecliptic, which is the plane in which Earth orbits the Sun. This means that Neptune's orbit is tilted by around 1.77 degrees compared to the average plane of the solar system.
Uranus is the planet that is most tilted on its orbital plane, with an axial tilt of 98 degrees. This extreme tilt causes Uranus to essentially roll on its side as it orbits the Sun, resulting in highly irregular seasons and a unique magnetic field.
Since Pluto, with an inclination of about 17.15 degrees, has been relegated to minor-planet status, the honor passes to Venus with an orbital inclination of approximately 3.39 degrees. See http://www.nineplanets.org/data.html
Mercury and Pluto.
There isn't one. They all orbit in roughly the same plane. Pluto orbits in a different plane, but that's not classed as a planet now, of course.
Pluto is the planet that has the lowest orbital velocity relative to that of the earth. The orbital velocity of Pluto is 0.159.
All planets lie in the plane of their orbit, but most spin on an that is nearly (many have tilted axes of spin) perpendicular to that plane. The one exception is the planet Uranus which has its axis of spin lying very close to its orbital plane.