cross word puzzle

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Across
  1. 4. italian renaissance artist
  2. 6. the science that deals with the materials beyond the earths atmosphere
  3. 7. according or agreeing with the principals of writing
  4. 8. the activity, spirit, or time of the great revival of art, literature, and learning
Down
  1. 1. a form of chemistry and speculative philosophy practiced in the middle ages
  2. 2. italian scientist
  3. 3. accepting reasons as the supreme authorities in matters of opinion
  4. 5. a coherent group of tested general propositions