Crossword - Structure of the Universe

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Across
  1. 3. Optical instrument designed to see distant objects
  2. 5. Group of galactic clusters
  3. 7. Largest known structure in the universe which forms part of a galactic web
  4. 9. A unit of distance defined as the distance light travels in one year
  5. 13. Celestial body with a supermassive black hole as its nucleus that feeds on surrounding material
  6. 14. A widely accepted explanation of how the universe came to be
Down
  1. 1. Celestial body with such intense gravity that nothing can escape
  2. 2. cloud of gas and dust known for producing stars
  3. 4. Grouping of hundreds or thousands of galaxies bound together by gravity
  4. 6. Consists of all existing matter that exists
  5. 8. Massive cloud of gas and dust known for producing stars
  6. 10. System consisting of stars, gasses, and dust held together by gravity
  7. 11. Vast, empty region in space with little to no forms of matter
  8. 12. American astronomer who is known as the “pioneer of distant stars”