The Sun & Stars, Galaxies, & the Universe. Composition & Age of the Sun Hydrogen and helium make up over 99% of the sun’s mass. About 75% of the sun’s.
Our Place in the Cosmos Lecture 12 Stellar Evolution.
I.) Properties of Stars A.Color and Temperature 1.A star’s color indicates that temperature of its surface a.Hottest stars (surface temps above 30,000K)
Stars
The life history of a star depends primarily on its mass A little bit on its metallicity ( Z )
