A supernova is a powerful explosion of a star when it dies. Stars are giant balls of gas in space. The stars are very hot! They can be up to 800,000 degrees Fahrenheit! Our own Sun is also a star. It supplies us with light and heat. Stars take millions of years to form. The star uses hydrogen in it’s core and turns it into helium. As this happens, it uses up the energy in it’s core, so the star starts to fade. If a star is big enough, the star can cause a supernova which happens when a star explodes and releases light, heat, and energy into space!!