Use stream of consciousness to answer the following. The CNO cycle (for carbon -- nitrogen -- oxygen) is one of the two known sets of fusion reactions by which stars convert hydrogen to helium, the other being the proton -- proton chain reaction. Unlike the latter, the CNO cycle is a catalytic cycle. It is dominant in stars that are more than 1.3 times as massive as the Sun.

Answer this question based on the passage: the cno cycle dominates in which types of stars?
The relevant information is: It is dominant in stars that are more than 1.3 times as massive as the Sun. Final answer: stars that are more than 1.3 times as massive as the Sun.