Science puzzle N.

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Across
  1. 3. stars are in it
  2. 5. System our earth is in it
  3. 7. Stars are formed in it.
  4. 8. full moon
Down
  1. 1. you see all of it
  2. 2. You're Welcome
  3. 4. you need it or we die! :)
  4. 5. has something around.
  5. 6. how old u are.