MP's Vocabulary Crossword

4. Chain of thermonuclear reactions that is the chief source of the energy radiated by the Sun and other cool main-sequence stars.
6. A region of cosmic gas and dust formed from the cast-off outer layers of a dying star.
7. The Pauli exclusion principle states that no two electrons with the same spin can occupy the same energy state in the same volume.
11. At a star's core, outward pressure is generated by thermonuclear fusion between hydrogen atoms to form helium.
13. The pressure on a surface resulting from electromagnetic radiation that impinges on it, which results from the momentum carried by that radiation.
14. Sequence of thermonuclear reactions that provides most of the energy radiated by the hotter stars.

1. Large volumes of gas and dust in space, which can evolve from diffuse clouds to denser dark clouds.
2. A state of balance between gravity, which wants to pull things together, and pressure, which wants to blow it apart.
3. The process by which elements are formed within stars as they evolve.
5. Extremely dense pockets of matter, objects of such incredible mass and miniscule volume that they drastically warp the fabric of space-time.
8. A quantum mechanical phenomenon that arises from the Pauli exclusion principle.
9. Young stars within the earliest phase of stellar evolution.
10. A sudden onset of nuclear fusion of helium into carbon in the core of a low-mass star.
12. Dramatic explosions that take place during the final stages of the death of a supermassive star.