Stars in the universe
Stars A star is a huge sphere of very hot, glowing gas mostly hydrogen and helium held together by its own gravity. Stars produce their own light and energy by a process called nuclear fusion. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements. The Sun is the closest star to Earth. · The Sun The Sun is the closest star to Earth. Every star you see in the night sky is bigger and brighter than our sun, only a handful of very faint stars are approximately the same size and brightness of our sun and the rest are all bigger and brighter than our sun by a large percentage. · Closest star to sun The nearest neighbor is Alpha Centauri, it's actually a triple-star system bound together by gravity Alpha Centauri A and B are two...