* Pluto is no longer classified as a planet. It's now considered a dwarf planet.

* Gravity is determined by mass and size. Smaller objects have less gravity.

So, while Pluto *used* to be the "planet" with the least gravity, it's not a planet anymore.

The dwarf planet with the least gravity is likely Eris. It's slightly more massive than Pluto, but it's also a bit larger. This means its surface gravity is slightly less than Pluto's.

Important Note: There are many other dwarf planets in our solar system, and their exact gravity is still being studied!