Final answer:
Supergiant stars with core mass > 3 Msun collapse to become black holes.
Explanation:
A supergiant star is the type of star that will become a black hole when it dies. When massive stars exhaust their fuel supplies, they undergo a supernova explosion and may collapse into a black hole, leaving behind an extremely dense object with massive gravitational pull. This transformation occurs when the core mass of the star is greater than about 3 Msun.
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