Planets

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Across
  1. 2. is the smallest and innermost planet in the Solar System.
  2. 4. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System
  3. 5. It only has one-eighth the average density of Earth
  4. 6. is the third planet from the Sun and the only astronomical object known to harbor life
Down
  1. 1. is the fifth planet from the Sun and the largest in the Solar System.
  2. 2. carries the name of the Roman god of war and is often referred to as the "Red Planet"
  3. 3. It is named after the Roman goddess of love and beauty.