Do you remember the first weeks of class?

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Across
  1. 1. the closest natural satellite to the earth, 240,000 miles away
  2. 2. this tissue is responsible for creating sharp central vision
  3. 6. these type of glasses are needed to treat nearsightedness
  4. 7. Jupiter, Saturn, Uranus and Neptune are examples of gas _____?
  5. 9. the largest planet in our solar system
  6. 12. this reflects light back for a second chance if it misses the rods in the eyes
  7. 14. was once considered the furthest planet in our solar system
  8. 15. the big bang and the steady state are both an example of a ______?
  9. 16. our is named the Milky Way
  10. 17. an area in the sky named after a collection of stars
  11. 20. "nuclear glue"
  12. 21. we're lucky this substance expands when it is in a solid state
  13. 23. interstellar cloud of dust, hydrogen, and helium
  14. 24. when a suns gravity is so great it is able to crush atoms
Down
  1. 1. the planet that has the most properties that are similar to earth
  2. 3. this nerve transmits visual information to the brain
  3. 4. responsible for color vision in the eyes
  4. 5. the antimatter that is the counter part of electrons
  5. 8. this reaction will take place with a new element when the sun runs out of hydrogen
  6. 10. no color vision, used in dim light, to see out of corners of the eye
  7. 11. the closest planet to the sun
  8. 13. a phenomena that is seen when a wave encounters an obstacle
  9. 18. an atom particle with no charge
  10. 19. the light sensitive tissue in the back of the inner eye
  11. 22. once things goes in this hole, nothing comes out