This happens to massive stars—at least five to eight times the mass of our Sun. As the star runs out of nuclear fuel, its core becomes unstable. Gravity eventually wins the "tug-of-war" against outward pressure, causing the core to collapse in milliseconds. The outer layers then rebound off the dense core and explode outward into space. Scientific Significance
Beyond their visual spectacle, supernovas are essential to the evolution of the cosmos: What Is a Supernova? | NASA Space Place Supernova
A is the largest and most energetic explosion known to occur in the universe, marking the dramatic end of a star's life cycle. These cosmic blasts are so luminous that they can briefly outshine an entire galaxy and release more energy in an instant than our Sun will produce over its multi-billion-year lifetime. Core Mechanisms of Explosion This happens to massive stars—at least five to
This occurs in a double-star system where one star is a carbon-oxygen white dwarf. The white dwarf "steals" matter from its companion star. Once it reaches a critical mass (the Chandrasekhar limit), it triggers a runaway nuclear fusion reaction that completely obliterates the star. The outer layers then rebound off the dense
While there are several sub-categories, astronomers generally classify supernovas into two primary types based on what triggers the final collapse: