"Great Debate" Resolved

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Across
  1. 3. astronomer with a telescope names after him
  2. 4. our neighbor galaxy
  3. 5. Harlow Shapley thought that the milky was was 300,000 of these across
  4. 7. our galaxy
  5. 8. Where chemists and astrophysicists might meet
Down
  1. 1. what astronomers originally thought that galaxies were
  2. 2. The name of the disagreement between astronomers Shapley and Curtis about our Milky Way
  3. 6. system of stars and nebulae