Blurs

We often describe stars as enormous nuclear furnaces, burning through their fuel for millions or billions of years. Eventually, however, that fuel runs low, the star changes, and we call it a “dying star.” But there is something seemingly contradictory about this description. If a star is dying, why can its final stages produce some of the most energetic events in the entire universe?  A massive star can suddenly release an almost unimaginable amount of energy, briefly becoming brighter than billions of stars combined. So where does all that energy come from? The answer is more surprising than simply saying that the star has one last burst of nuclear fuel.  In the final stages of a massive star's life, gravity itself becomes a major source of the energy released. As the star's core collapses under its own enormous weight, matter is compressed to extraordinary densities and gravitational energy is converted into heat, radiation, particles and explosive motion. The result is a r...