A white dwarf star is a faint star of enormus density a dwarf star is a sun thats burnt all its fuel. a white dwarf star is the size of the earth but as heavy as the sun. some of the white dawrfs might be 12 to 13 billion years old which is almost the same age of the universe. white dwarfs dont move through the galaxy. if you had a teanspoonful of white dwarf matter it would weigh as much as an elephant.