hydrogen is what stars are mostly made Being the reservoir from which new stars are born in the Galaxy, interstellar matteris of fundamental importance in understanding both the processes leading to the formation of stars, including the solar system, and ultimately the origin of life in the universe. Stellar evolution stellar evolution is a necessary consequence of the physical theory of stellar-structure, which requires that the luminosity, temperature, and size of a star must change as its chemical composition changes because of thermonuclear reactions.

ken mendoza

PHIL.....