# Why is there matter at all?

**Why is there more matter than antimatter?**

Our best laws treat them almost symmetrically, and still the universe is made of matter. A small difference in the early universe must have tipped the balance, and where it came from is open.

Connects to:
- [Symmetry](https://mapideas.org/i/mat_symmetry)
- [The expanding universe](https://mapideas.org/i/as_expansion)

Sources:
- [Wikipedia: Baryon asymmetry](https://en.wikipedia.org/wiki/Baryon_asymmetry)

Source: https://mapideas.org/i/q_math_matter · open on the map: https://mapideas.org/#q_math_matter