Space and Celestial Bodies

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Across
  1. 3. A natural satellite of a planet
  2. 5. the largest planet in our solar system.
  3. 6. Dusty snowball which orbits the sun
  4. 9. Group of planets, asteroids, comets and other celestial bodies that are in orbit around a star
  5. 10. Large system of starts held together by gravity.
  6. 11. A celestial body that generates its own light and heat and consists of a mass of gas held together by its own gravity.
  7. 12. The name of our galaxy.
Down
  1. 1. The first letter of each planet in order.
  2. 2. All of space and time and its contents.
  3. 3. the first planet in out solar system.
  4. 4. The theory that explains the origin of the universe.
  5. 7. A planet is a celestial body that orbits around a star. It must have enough mass to form an almost round shape. It must have cleared the region around its orbit of other celestial bodies.
  6. 8. Small, rocky body orbiting the sun