Certain stars, after their nuclear fusion possibilities end, areexpected to collapse (gravitationally) so completely that theirinterior protons and electrons combine to form neutrons. Such astar could be thought of as a giant atomic nucleus. If a sun-likestar (M = 1.99E30[kg]) became all neutrons (mass = 1675 Fontsize="-1">E-30[kg]), what would its radius be?Regular nuclei have constant density, so their radii depend ontheir mass number : rA = (1.2[femto-meter]) A1/3 .
[physics]
Does the negative mass of antimatter mean that it's gravitationally repelled from stars?