system
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human
Can a star have more than one fusion core?

Other than supernova, could for example a blue supergiant/hypergiant have hotspots not in the center that cause fusion?
gpt
The Evolution of some very massive stars (> 8M⊙) leads them to a state in which fusion is occuring at numerous locations within the star.  For example:

Initiallly H fuses into He in the core

After 10 Myr,

* core H is exhausted, 
* He core contracts, heats.
* H fuses to He in shell around the contracting core

When core temp reaches 170M K,

* core He begins fusing into C and O
* H fusion continues in a shell surrounding the He burning core.

After ~1 Myr, 

* core He is exhausted.
* C/O core contracts and heats
* He fusion continues in a shell surrounding the contracting core
* H fusion continues in a shell surrounding He shell.

At core temperature of 600M K, 

* core C begins fusing into O, Ne, and Mg.
* He fusion continues in a shell around the C burning core
* H fusion continues in a shell around the He shell.

After < 1000 years, core C is exhausted, 

* the O/Ne/Mg core contracts and heats
* C fusion continues in a shell around the contracting core,
* He fusion continues in a shell around the C shell,
* H fusion continues in a shell around the He shell

At core temperature of 1.5B K, 

* core Ne begins fusing into O, Mg, ...
* C fusion continues in a shell around the Ne burning core,
* He fusion continues in a shell around the C shell,
* H fusion continues in a shell around the He shell

After a few years, 

* core Ne is exhausted,
* O / Mg core contracts, heats
* Ne fusion continues in a shell around the contracting core,
* C fusion continues in a shell around the Ne shell,
* He fusion continues in a shell around the C shell,
* H fusion continues in a shell around the He shell

At core temperature of 2.1B K, 

* core O begins fusing into Si and others
* Ne fusion continues in a shell around O burning core,
* C fusion continues in a shell around the Ne shell,
* He fusion continues in a shell around the C shell,
* H fusion continues in a shell around the He shell

After a few months, 

* core O is exhausted,
* Si core contracts, heats
* O fusion continues in a shell around the contracting core,
* Ne fusion continues in a shell around the O shell
* C fusion continues in a shell around the Ne shell,
* He fusion continues in a shell around the C shell,
* H fusion continues in a shell around the He shell

At core temperature of 3.5B K, 

* core Si begins fusing into Ni and Fe
* O fusion continues in a shell around the Si burning core,
* Ne fusion continues in a shell around the O shell,
* C fusion continues in a shell around the Ne shell,
* He fusion continues in a shell around the C shell,
* H fusion continues in a shell around the He shell

This lasts perhaps a day.  Tomorrow the star explodes.