Fusion - where does it occur?

1. The Sun's core
Sun in helium light - http://sohowww.nascom.nasa.gov/data/realtime/eit_304/512/
Solar core - http://en.wikipedia.org/wiki/Solar_core

2. Tokamak fusion devices
JET - http://en.wikipedia.org/wiki/Joint_European_Torus
ITER - http://www.iter.org/


Types of fusion reactions -

1. proton-proton chain
2. DT fusion
3. helium 3 fusion