Space crossword

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Across
  1. 2. have people ever set foot on mars?
  2. 5. Who is a person that travels to space to explore it?
  3. 8. What is the planet we live in?
  4. 9. What is the thing that keeps us hot and warm?
  5. 10. Which is the coldest planet?
Down
  1. 1. What is the smallest planet?
  2. 3. What is the biggest planet?
  3. 4. What comes out in the clear night sky
  4. 6. What is the second biggest planet?
  5. 7. What is the hottest planet?
  6. 11. is earth bigger than neptune?