Gravitation (or gravity) is a force of attraction. It is produced by all pieces of matter in the universe and pulls on all pieces of matter in the universe, regardless of matter type. Galaxies produce gravity. The Sun and the planets produce gravity. Even the keyboard I’m typing on produces gravity (although only a very small amount). In short, every object is surrounded by what we call a gravitational field that pulls any other object inside that field towards it.
Because it comes from all matter, gravity is what we call a universal force. You may tend to think of it as simply the force which pulls us down to the Earth but, in truth, the effects that gravity has are virtually endless and can be found just about everywhere.
