What is the approximate ratio of hydrogen to helium in sun
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Our's sun solar mass is too low to achieve 'core collapse', accordingly. Compression, yes. Helium flash, yes. Likewise, while the hydrogen to helium proportion will have progressively changed after some time, it won't be the trigger for the following stage - the helium flash and triple alpha process (where heavier components are made). In that sense it's not "required", it will simply "be".
The hydrogen to helium proportion will be the point at which the helium core ignites however you could surely show it on the off chance that you needed. While the core hydrogen will have been drained the shell is as yet 'consuming' hydrogen and will keep on doing so. The trigger for ignition will be the helium core temperature as opposed to the general hydrogen to helium proportion itself.
The hydrogen to helium proportion will be the point at which the helium core ignites however you could surely show it on the off chance that you needed. While the core hydrogen will have been drained the shell is as yet 'consuming' hydrogen and will keep on doing so. The trigger for ignition will be the helium core temperature as opposed to the general hydrogen to helium proportion itself.
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