1. Gravity: This is the force of attraction between any two objects with mass. It's what keeps us on the ground, the planets orbiting the sun, and galaxies together. The more massive an object is, the stronger its gravitational pull.
2. Electromagnetism: This force governs the interaction between charged particles. While it doesn't directly keep the universe moving in the same way gravity does, it plays a crucial role in how things behave within it. Electromagnetism is responsible for the formation of atoms, the binding of molecules, and the existence of light and other forms of electromagnetic radiation.
It's important to note that these are just two of the four fundamental forces in the universe. The other two are:
* Strong Nuclear Force: This force holds the nucleus of an atom together, overcoming the electromagnetic repulsion of protons.
* Weak Nuclear Force: This force is responsible for radioactive decay and other nuclear processes.
While the universe is expanding due to the Big Bang, these forces continue to play a major role in the interactions and evolution of matter within it.
