Here's why:

* Small Size: Pluto is a dwarf planet, much smaller than Earth. Its mass is only about 0.2% that of Earth.

* Lower Density: Pluto is made up mostly of rock and ice, which are less dense than the materials that make up Earth.

* Gravitational Force: Gravity is directly proportional to mass. Since Pluto has a much smaller mass than Earth, its gravitational pull is significantly weaker.

Here's a comparison:

* Earth's surface gravity is about 9.8 m/s², meaning if you drop an object, it will accelerate towards the ground at that rate.

* Pluto's surface gravity is only about 0.62 m/s², which is less than 1/16th that of Earth.

This means that if you could stand on Pluto, you would feel much lighter than you do on Earth!