Whether people grow up to be tall or short or have big or small bones depends on the genes they get from their parents. But a star’s life is shaped by only one thing: how massive it is when it is born.
Stars with greater mass burn hotter and brighter. They also burn out faster. So stars that keep cool live longer by burning slower. The hottest stars are blue, and the coolest stars are red, while others are yellow, like our Sun. Most stars in our galaxy are red dwarfs. Here are some of the different kinds of stars.
