Space Science

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Across
  1. 3. The planet we live on
  2. 4. 4.5 billion-year-old yellow dwarf star
  3. 6. second planet from the Sun
  4. 8. discovered in 1781 by astronomer William Herschel
  5. 9. did not meet the three criteria the IAU uses to define a full-sized planet
  6. 10. Its half the size of Earth
  7. 11. first planet from the Sun and the smallest planet in the Solar System
  8. 12. 17 times the mass of Earth
  9. 13. Belt doughnut-shaped ring of icy objects around the Sun
Down
  1. 1. the planet with rings
  2. 2. asteroid belt torus-shaped region in the Solar System
  3. 5. unit of length
  4. 7. the largest planet in the solar system