Inner Planets

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Across
  1. 2. has the shortest orbit around the Sun
  2. 3. the layer of gases varying in thickness and composition around a planet
  3. 6. the 4 planets in our solar system farthest from the Sun
  4. 8. Earth's sister planet
  5. 9. moves repeatedly around
  6. 10. the 4 planets in our solar system closest to the Sun
Down
  1. 1. earth-like
  2. 4. known as the Red planet
  3. 5. celestial object that orbits a planet
  4. 7. contains water and oxygen needed for life