👉 A supernova is a massive star that collapses under its own gravity and emits an immense amount of energy in the form of electromagnetic radiation. These explosions are one of the most intense phenomena in the universe, occurring at distances of up to 10 light-years from Earth. The explosion of a supernova can produce a vast amount of matter, including hydrogen and helium, which is the building block of stars. In addition to producing significant amounts of energy, supernovas also release a high amount of