Stellar Transformation refers to the processes that stars undergo throughout their lifetimes. Stars are born from clouds of gas and dust, which collapse under gravity to form a dense core. As the core heats up, nuclear fusion begins, allowing the star to shine. Over millions to billions of years, stars evolve through various stages, depending on their mass. When a star exhausts its nuclear fuel, it undergoes significant changes. Low to medium-mass stars, like our Sun, expand into red giants and eventually shed their outer layers, forming planetary nebulae. More massive stars may explode in a supernova, leaving behind neutron stars or black holes.