Astronomy Crossword

2. sequence of thermonuclear reactions that provides most of the energy radiated by the hotter stars
6. a transient astronomical event that causes the sudden appearance of a bright "new" star
9. spend billions of years fusing hydrogen to helium in their cores via the proton-proton chain
10. results from the rapid collapse and violent explosion of a massive star
11. determines if a star dies as a white dwarf, or has the mass to exceed this, launching a supernova to create a black hole or neutron star
14. a quantum mechanical effect critical to understanding the stability of white dwarf stars and metal solids

1. a state of matter in which neutrons are packed so densely that they cannot occupy the same quantum state
3. the tendency of a system to preserve its rotational momentum when there is no external torque acting upon it
4. system of two astronomical bodies of the same kind that are comparable in size
5. a ring-shaped nebula formed by an expanding shell of gas around an aging star
7. refers collectively to white dwarfs, neutron stars, and black holes
8. rapidly rotating neutron stars that blast out pulses of radiation at regular intervals ranging from seconds to milliseconds
12. a type of neutron star with an extremely powerful magnetic
13. is a star that has collapsed to the size of the earth and is in the final stage of evolution for low-mass stars