Labels:text | screenshot | circle OCR: SUPERNOVAS A SUPERGIANT STAR of more than 10 solar masses ends its life in a huge explosion called a supernova. The explosion is so energetic that it may outshine an entire galaxy of billions of stars. For a time, the supernova may appear from Earth to be a new, very bright star. If the explosion leaves behind a core of between 1.4 and 3 solar masses, the core shrinks to form a neutron star. If the core is greater than 3 solar masses, gravity forces it to contract further to form a black hole. CELESTIAL FIREWORK The core of a dying supergiant star collapses in less than a second. The sudden collapse creates a shock wave that throws FACT SELECTED off the star's outer layers. FILE SUPERNOVAS
