Astronomy Unit

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Across
  1. 2. the death of a star by a tremendous explosion which releases huge amounts of energy
  2. 4. a flattened disk of stars with spiral arms and a central bulge that contains both young and old stars
  3. 6. where stars spend most of their active life fusing hydrogen to helium and form the diagonal pattern down the center of the H-R diagram
  4. 11. group of stars that have an irregular structure and do not fit into the other categories
  5. 14. Diagram Hertzsprung-Russel diagram; a graph that shows the relationship between a stars temperature and absolute magnitude
  6. 17. groups of stars within galaxies
  7. 18. range of wavelengths; can be used to detect heat
  8. 20. the entire range of electromagnetic waves including radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, gamma rays, and cosmic rays
  9. 23. an instrument used to observe light waves from the electromagnetic spectrum
  10. 24. a large group of stars in space
  11. 25. theory that states that the universe began with a tremendous explosion approximately 15 billion years ago
  12. 26. huge bright ball of gas and dust in space
Down
  1. 1. the next stage in a stars life cycle after a white dwarf when the star has "burned out" and no longer shines blackhole final stage in the evolution of a very massive star, where the core's mass collapses to a point that its gravity is so strong that not even light can escape
  2. 3. a star that expands and cools once it runs out of hydrogen
  3. 5. a ring-shaped nebula formed by an expanding shell of gas around an aging star; occurs when a star "dies"
  4. 7. a star like source of light that is extremely far away and one of the most powerful sources of energy in the universe
  5. 8. a large cloud of dust and gas in space where new stars are formed
  6. 9. measure of a stars brightness as seen by an observer on Earth
  7. 10. shortest wavelength on the (EM) spectrum; carry the most energy of any wave
  8. 12. a shift in the spectra of very distant galaxies toward longer wavelengths
  9. 13. a star that forms after a supernova in which nearly all the particles have become neutrons
  10. 15. massive groups of old stars that look like spheres or elongated oval shapes with bright centers
  11. 16. all space and matter that space contains
  12. 19. the system composed of the sub (a star) and the planets and other bodies that travel around the sun
  13. 21. relative quantity or brightness of light
  14. 22. a spinning neutron star that emits rapid pulses of light