Most all of the matter in the universe is made up of protons, neutrons, and electrons. Protons are relatively massive particles which carry a positive electrical charge.
Electrons are low-mass particles which carry a negative electrical charge.
Neutrons have the same mass as protons, but they carry no charge. The fundamental forces of nature determine how these particles are arranged and how they interact with one another. An attractive force between any two masses . Like charges repel. Opposite charges attract.