As non-fusing core plasma gets compressed by gravity, free electrons get forced into close proximity which even electromagnetic repulsion cannot overcome. As they get closer together, this corresponds to smaller range of __________ each electron can occupy. According to the Heisenberg __________, the result is a greater range of __________ these electrons can possibly have. The Pauli __________ requires that they move faster as they get closer together because two identical electrons cannot occupy the same location. __________ particles exert a greater pressure, which continues to increase as the core's density increases until it balances the inward force of gravity. This is called degeneracy pressure. In a dying __________ star, this is provided by __________. In a dying __________ star, gravity can compress it further until eventually electrons combine with protons and form neutrons. Then __________ can balance the force of gravity