Star Evolution

3. Tiny particles made up of neutrons, protons, and electrons
6. A structure that forms as the remaining core of a red giant
8. The longest stage of a star's life
10. A structure that forms as hydrogen in a nebula spins faster and the temperature increases
11. A structure that forms when stars run out of hydrogen and their outer layers expand and cool
12. An explosion in which a super red giant expels heavy elements into space
13. A structure that forms when the carbon core of an average star collapses, expelling the outer layers

1. The process by which lighter elements combine to form heavier elements
2. A giant cloud of gas and dust in space
4. An object that forms with a gravity so strong that not even light can escape
5. A structure that forms when the mass of the remaining core after a supernova is between 1.4 and 3.0 times the mass of the sun
7. The lightest element, a single proton
9. Different types of individual atoms, determined by the number of protons they contain