Inner planets

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Across
  1. 3. : A celestial object that orbits a planet.
  2. 5. : Mercury, Venus, Mars, Earth.
  3. 7. : Has the shortest orbit around the Sun.
  4. 8. : Known as the red planet.
  5. 9. : Contains water and oxygen needed for life.
Down
  1. 1. : They are like earth in some ways.
  2. 2. : Earth's sister planets.
  3. 4. : Jupiter, Saturn, Uranus and Neptune.
  4. 6. : The sun and everything around it that orbits.