We've already landed on an outer solar system body, Saturn's moon Titan. https://en.wikipedia.org/wiki/Huygens_(spacecraft) https://en.wikipedia.org/wiki/Huyge

We've already landed on an outer solar system body, Saturn's moon Titan. https://en.wikipedia.org/wiki/Huygens_(spacecraft) https://en.wikipedia.org/wiki/Huygens_(spacecraft) Titan does have the advantage of a thick atmosphere to allow descent by parachute, and a large parent body to capture the spacecraft into orbit.