Classifier Instance:

Anchor text: Carl von Weizsäcker
Target Entity: Carl_Friedrich_von_Weizs\u00e4cker
Preceding Context: The CNO cycle (for carbon–nitrogen–oxygen) is one of two sets of fusion reactions by which stars convert hydrogen to helium, the other being the proton–proton chain. Unlike the proton–proton chain reaction, the CNO cycle is a catalytic cycle. Theoretical models show that the CNO cycle is the dominant source of energy in stars more massive than about 1.3 times the mass of the Sun. The proton–proton chain is more important in stars the mass of the Sun or less. This difference stems from temperature dependency differences between the two reactions; pp-chain reactions start occurring at temperatures around , making it the dominant energy source in smaller stars. A self-maintaining CNO chain starts occurring at approximately , but its energy output rises much more rapidly with increasing temperatures. At approximately , the CNO cycle starts becoming the dominant source of energy. The Sun has a core temperature of around and only of nuclei being produced in the Sun are born in the CNO cycle. The CNO-I process was independently proposed by
Succeeding Context: and Hans Bethe in 1938 and 1939, respectively.
Paragraph Title: null
Source Page: CNO cycle

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