Stars

Stars are massive, luminous spheres of hot gases, primarily hydrogen and helium, that generate light and heat through nuclear fusion in their cores. This process converts hydrogen into heavier elements, releasing enormous energy that radiates outward, making stars visible across vast distances. Stars vary in size, brightness, and lifespan, depending on their mass. They form from clouds of gas and dust in space, and their life cycle includes stages such as main sequence, giant, and, eventually, remnants like white dwarfs, neutron stars, or black holes. Stars are fundamental to the universe, creating elements and influencing galaxy formation.