Helium Fusion

Nuclear fusion reaction in a hypothetical universe with only helium and no hydrogen ?

What nuclear fusion reaction would be powering stars in a hypothetical universe with only Helium and no Hydrogen ?

stars would have to be several times more massive to be able to fuse helium in a helium only universe. the stars would be constantly in a red giant phase. they would break down their nuclei forming carbon,oxygen and nitrogen in what is called the CNO cycle, the carbon-nitrogen-oxygen cycle. this process has very low power output, this universe would be cooler and dimmer than it is today.

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Helium Fusion