The outward force from its fusion can no longer counteract the star's powerful gravity, and the star collapses in on itself.

When and where supernovae occurred is important. When a star explodes in a supernova explosion it emits radiation, and it’s thought that planets recently exposed to radiation from supernovae are ...

The article is titled "Hydrodynamics and Nucleosynthesis of Jet-Driven Supernovae II: Comparisons with Abundances of Extremely Metal-Poor Galaxies and Constraints on Supernova Progenitors." ...