Inner Planets

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Across
  1. 4. planets that are like the Earth
  2. 5. gasses that surround a planet
  3. 9. the 4 planets closest to the sun
  4. 10. Earth's sister planet
Down
  1. 1. moves around repeatedly
  2. 2. known as the Red Planet
  3. 3. the 4 planets farthest from the sun
  4. 6. celestial object that orbits a planet
  5. 7. contains water and oxygen
  6. 8. has the shortest orbit around the sun