The planet with the greatest gravitation pull in Earth's solar system is Jupiter. NASA measures the gravity of other planets in relation to Earth. Gravity on Jupiter is about 2.36 times that of Earth, and Pluto has the weakest gravity, which is about 0.059 times Earth's gravity.
Jupiter has the largest mass of any planet in Earth's solar system, but mass alone doesn't determine gravity. Its pull exists between any two objects with mass, and its strength is determined by their separation distance as well as their masses, according to Newton's Law of Gravity. Gravity is a force of attraction that not only forms planets but also keeps them in orbit around the sun and causes stars to pull together to create galaxies.