What factor limits the theoretical upper mass limit for stars, causing them to potentially blow apart upon formation?

Answer

Outward pressure from radiation alone overcomes gravity.

The theoretical upper limit for stellar mass, around 150 to 300 solar masses, exists because beyond this point, the immense outward pressure generated by radiation exceeds the inward force of gravity, leading to the star being blown apart.

What factor limits the theoretical upper mass limit for stars, causing them to potentially blow apart upon formation?

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