Words of the day crossword

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Across
  1. 3. people are together
  2. 5. say "yes"
  3. 6. planets, stars, comets
  4. 7. change form
  5. 8. Milky Way
Down
  1. 1. ????
  2. 2. you can't die
  3. 4. defend
  4. 6. muscles