Inner Planets.

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Across
  1. 3. A mixture of gases surrounding a planet.
  2. 4. The first four planets of the Solar System.
  3. 5. Earth-like.
  4. 7. An object moving repeatedly in a specified path, usually circular or elliptical.
  5. 10. The first planet from the sun.
Down
  1. 1. An object that orbits around a planet.
  2. 2. The place every planet,asteroid, human and more lives in the universe.
  3. 6. The planet we live on.
  4. 8. The second planet from the sun, also called "Earth's sister"
  5. 9. The "red" planet because of the iorn oxide on its surface.