Match the word on the left with the definition on the right.

____ black dwarf e. star left at the core of a planetary nebula

____ white dwarf g. a red super giant star explodes

____ nebula c. what a medium-mass star becomes at the end of its life

____ protostar b. a large cloud of gas or dust in space

____ supernova a. exerts such a strong gravitational pull that no light escapes
____ neutron star d. the earliest stage of a star ’s life

____ black hole f. the remains of a high mass star