Cosmology Vocabulary (Ch 18)

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Across
  1. 4. A model of the universe where the universe it totally flat and infinite.
  2. 6. A form of matter that acts in opposition to gravity
  3. 8. A model of the universe where the universe expands forever
  4. 9. The stage in the early history of the Universe when ultraviolet photons from the first stars ionized the gas filling space
  5. 10. Visible matter
  6. 12. The average density of matter required for the Universe to halt its expansion
  7. 13. The condition of being uniform in all directions
  8. 15. The stage within a million years of the big bang when the gas became transparent to radiation
  9. 16. The time required for the Universe to expand to its present size
Down
  1. 1. A cosmic structure formed by a giant wall of galaxies
  2. 2. The mysterious force that causes the rate of expansion of the universe to accelerate over time
  3. 3. A model of the universe where the universe is shaped like a ball
  4. 5. Leftover radiation from the Big Bang
  5. 7. Matter that does not contain protons and neutrons
  6. 11. They discovered cosmic microwave radiation
  7. 14. The property of being uniform