Stars are luminous balls of gas that emit energy and light through nuclear reactions happening in their core. They are born from the collapse of large clouds of gas and dust, and their size and temperature determine their position on the Hertzsprung-Russell diagram, a graph that organizes stars based on their brightness and temperature. Stars come in various sizes, colors, and ages, and are integral to the structure and evolution of galaxies. They are also used as a celestial navigation tool and can give us insights into the formation and nature of the universe.
Stars are massive celestial bodies made up of hot gases that emit light and heat due to thermonuclear reactions happening in their cores. They are held together by gravity and are predominantly composed of hydrogen and helium, with trace amounts of other elements. Stars come in various sizes, colors, and temperatures. They exist in vast numbers throughout the universe, with our Sun being the closest star to Earth. Stars play a crucial role in the formation of galaxies and serve as the primary source of energy and light in the universe.
