Science crossword

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Across
  1. 3. the study of science
  2. 6. the earth and stars are in it
  3. 7. the only planet with intelligent life
  4. 9. the brightest thing in the night sky
  5. 10. the study of the universe and it's contents
Down
  1. 1. a chocolate bar was named after it
  2. 2. the symbol for water
  3. 4. ding a practical in science
  4. 5. pulls everything towards the middle of earth
  5. 8. supply's light to earth