Hydrogen is still available outside the core, so
hydrogen fusion continues in a shell surrounding the core.
Hydrogen fusion continues only in the star's outer layers, which causes it to expand.
Not exact matches
These large protostars
continue to contract, but instead of producing heat through contraction alone, they begin to convert
hydrogen into helium in a process known as thermonuclear
fusion.
It
continues until the core helium supply is exhausted, after which helium
fusion is limited to a shell around the core, just as was the case for
hydrogen in an earlier stage.
During that time, it will
continue to convert
hydrogen into helium in its core through a process called nuclear
fusion.