The Life Cycle of a Star Crossword

A massive star becomes a _ after the main-sequence stage.
A massive star could turn into a _ after becoming a supernova.
A _ is the leftover core of a planetary nebula.
A star's _ determines whether it will become a red giant star or a supergiant star.
Dust and gas in a nebula get pulled together by gravity to form a _.
Once a supergiant star runs out of fuel, it explodes quickly, becoming a _.
A _ is an object with gravity so strong that nothing, not even light can escape.
A _ is a large cloud of gas and dust spread out over an immense volume.
A star spends most of its life in the _ stage.
A star is born when the contracting gas and dust from a nebula becomes so hot that a process called _ starts
An average star becomes a _ once its fuel starts to run out.
After billions of years, a white dwarf eventually staops glowing and becomes a _.
The outer parts of a red riant grow larger, drifting out into space, forming a glowing cloud of gas called a _.