But what is string theory? A simple explanation to string theory is that it is the basic fundamental building block for everything. When all the matter in the universe is broken down to its most basic component, it will be tiny particles that look like strings; String Theory.
This diagram shows our cosmic address at a glance. We see our planetary system around the Sun, our stellar neighborhood in our galaxy, our galaxy in the local group of galaxies, and our group in the entire universe.