Solar Systems & Big Space

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Across
  1. 4. everything that exists in, on and around the Earth
  2. 6. a comparison of two numbers that each represent the parts of a whole
  3. 7. the eighth planet from the Sun and the farthest known planet in the Solar System.
  4. 8. second planet from the Sun
  5. 10. a fundamental interaction which causes mutual attraction between all things with mass
  6. 11. a group of solar systems, dust, and gas held together by gravity
  7. 13. The ratio of the length in a drawing (or model) to the length on the real thing
  8. 14. the smallest planet in our solar system
Down
  1. 1. the fifth planet from the Sun and the largest in the Solar System. It is a gas giant.
  2. 2. the number of an object
  3. 3. the fourth planet from the Sun – a dusty, cold, desert world with a very thin atmosphere.
  4. 5. the collection of eight planets and their moons in orbit around the sun
  5. 9. a pale blue gas planet and the seventh planet from the Sun.
  6. 12. the sixth planet from the Sun encircled with icy rings
  7. 15. our "home planet"