Aries vocabulary crossword puzzle

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Across
  1. 2. a dense centrally located concentration of stars found at the heart of most spiral and so galaxies
  2. 4. a dense spherical collection of hundreds of thousands to millions of ancient stars
  3. 7. the region of the sky along the milky ways galactic equator that is largely obscured at visible wavelengths
  4. 8. cluster loosely bound groups of tens to thousands of young stars
  5. 10. young metal rich stars located in the disc and spiral of galaxies
  6. 12. explains the long lived persistent spiral structure of galaxies
  7. 13. way a spiral galaxy that contains our solar system
  8. 14. flattened rotating structure composed of gas dust and stars
  9. 15. a dense interstellar dust cloud containing concentrations of cosmic dust gas and plasma
Down
  1. 1. ancient metal poor stars formed early in the universes history
  2. 3. a cloud of ionized interstellar gas
  3. 5. nebula interstellar dust cloud that shines and reflects light
  4. 6. uses natural master radiantion to probe the physical processes in the atmospheres and circumstellar shells of late type stars
  5. 9. a large spherical and faint component surrounding a spiral galaxy
  6. 11. hypothetical first generation of stars formed in the early inverse composed entirely of primordial gas