The Universe

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Across
  1. 3. The planet known as the 'Red Planet'.
  2. 5. The second largest planet in the solar system.
  3. 6. A celestial body that resembles a small planets but lacks the necessary characteristics to be described as one.
  4. 7. A minor planet in the inner solar system.
  5. 9. A solid piece of debris from an object such as a comet or asteroid.
  6. 10. The closest planet to the sun.
  7. 12. The impact of two celestial bodies connecting, such as a meteorite hitting a planet.
Down
  1. 1. The star at the center of the solar system.
  2. 2. A planet comprised of mainly hydrogen and helium.
  3. 4. The collection of eight planets and their moons in orbit round the sun.
  4. 5. A vehicle or machine designed for flying in outer space.
  5. 8. The coldest planet in the solar system.
  6. 11. Takes approximately 365 days to rotate around the sun.