Judy Pyne, age 13, of Fredericton, E,B. , for her question:

Does everything have gravity?

Every mass of solid or liquid material has its own built in gravitation. Even a mass of cloudy gases exerts a pull of gravity. The strength of an objects gravitation depends upon its mass, which is the number of particles of matter it contains. The most massive object in the Solar System is the sun. Its pull of gravity is great enough to hold all the smaller members of the solar family in their proper places.

In a smaller scale, a mountain has gravity and so does a house. Your own body has a small amount of built in gravitation and so does the body of a tiny mouse.