# Acceleration of Cosmic Rays

- [Introduction](/docs/acceleration-of-cosmic-rays/introduction.md): Studying cosmic-ray acceleration implies trying to answer three questions: What is the source of power of cosmic rays? What is the actual mechanism? and can it reproduce the spectral index observed?
- [Fermi Mechanism](/docs/acceleration-of-cosmic-rays/fermi-mechanism.md)
- [Shock Acceleration](/docs/acceleration-of-cosmic-rays/shock-acceleration.md)
- [Maximum Energy](/docs/acceleration-of-cosmic-rays/maximum-energy.md)
- [Sources of Galactic Cosmic Rays](/docs/acceleration-of-cosmic-rays/sources-of-galactic-cosmic-rays.md)
- [Source of Extragalactic Cosmic Rays](/docs/acceleration-of-cosmic-rays/source-of-extragalactic-cosmic-rays.md)