When a star like our sun exhausts its fuel, thermonuclear reactions in its core cease, and it collapses to become a white dwarf. often the star will blow off its outer layers and lose some mass before it collapses. suppose a star with the sun’s mass and radius (the radius of the sun is 6.96×108m ) is rotating with period 25 days and then it collapses to a white dwarf with 51 % of the sun’s mass and a rotation period of 131 s. a) what is the radius of the white dwarf? b) compare your answer to the radius of the earth. c) compare your answer to the radius of the sun.