Question

Do all planets have gravity

Answer 1

Anything that has mass has gravity. The more mass something has (the bigger it is), then the more gravity it will have. ... Even the biggest building on the Earth is too small to haveenough gravity for you to notice it. But since planets are /really/ big, they have enough gravity to hold things down.

Answer 2

Depending on the size, mass and density of the object, the gravitational force it exerts varies.

Some planet have less mass,size or density than earth they will exert less gravitional force compare to Earth’s gravitatation (Gravity).