The Space Crossword Puzzle

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Across
  1. 1. I xxx a letter
  2. 4. Do you want to xxx a snowman?
  3. 5. The name of the first dog to orbit the Earth
  4. 6. The first mammal in space was a...
  5. 8. You look at the stars through a...
  6. 9. The Earth is a...
Down
  1. 1. Humans travel to space on a...
  2. 2. Saturn is xxx than Mercury
  3. 3. A bird and a plane can...
  4. 7. Sailor among the stars