Question

What type of star turns into a super giant and then explodes as a supernova?

Answer 1

Stars greater than two and a half times the mass of the sun, turns into super giant and explode as supernova. The force of gravity is huge to create iron at center due to fusion. Iron is the heaviest substance that a star can make in its life because other heavier elements require more energy to fuse together than they release, so the star collapses. For massive stars, this collapse is so violent that it causes a huge, catastrophic explosion known as a supernova. It is in these explosions that all elements heavier than iron are produced.