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2. nebula - a cloud of dust and gas from which stars form
3. main sequence stars - stars on the HR diagram that fuse hydrogen atoms to form helium atoms in their cores; accounts for about 90 percent of the stars in the universe
4. Hertzsprung-Russell (HR) diagram - shows the relationship between a star's temperature and its luminosity
5. red giant - a dying star in the final stages of stellar evolution
6. white dwarf - stars at the very end of their life that have burned up all of the hydrogen they once used as nuclear fuel
7. red giants - a massive star in the late stage of its stellar evolution that has exhausted its supply of hydrogen and have a yellow-orange to red appearance.
8. supernova - a large explosion that takes place at the end of a star's life cycle.
9. neutron star - any of a class of extremely dense, compact stars thought to be composed primarily of neutrons
10. black hole - a region of space having a gravitational field so intense that no matter or radiation can escape.
11. Doppler effect - an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other.
12. red shift - the wavelength of the light is stretched, so the light is seen as 'shifted' towards the red part of the spectrum
13. apparent magnitude - the perceived brightness of a star
14. absolute magnitude - a star's true brightness irrespective of its distance from earth
15. magnitude - brightness of a star
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