Space Crossword

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Across
  1. 2. Closest planet to Earth.
  2. 5. The first man on the moon.
  3. 7. Our galaxy.
  4. 8. Jupiter has 63 of these, Neptune has 14, and Earth only has 1.
  5. 10. The dwarf planet in our solar system.
Down
  1. 1. Earth's sister planet.
  2. 3. A luminous ball of gas held together by its own gravity.
  3. 4. The innermost and smallest planet.
  4. 6. Inhabitants of Mars.
  5. 9. Planets do this around the Sun.