Stars

Stars are cosmic energy engines that produce heat, light and ultraviolet rays/x-rays and other forms of radiation. They are composed largely of gasoline and plasma; a super heated state of matter composed of subatomic particles. Some stars have always stood out from the rest. Their brightness is a factor of how much energy they put out, which is called luminosity, and also how far away from the Earth they are. Stars in the heavens may also appear to be different colors because of the ranging temperatures. Hot stars are white or blue, while cooler stars are orange or red. Stars may occur in many sizes, which are classified in a range from dwarfs to super giants. Super giants may have radii a thousand times larger than that of our own sun.

Credit given to: http://science/nationalgeographic.com/science/space/universe/stars-article/