solar system 6-11

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Across
  1. 1. Which planet takes almost 30 Earth years to orbit the sun
  2. 5. Which of these American astronomers discovered Pluto in 1930
  3. 7. Who was the first living creature in space
  4. 8. A volcano that erupts ice! They exist on some moons of Jupiter and Saturn, where it’s really, really cold. They erupt watery mixtures that can be as cold as -177° F, or -116° C
  5. 10. Which of the following men wrote the book "On the Revolutions of
  6. 12. Name the heaviest object ever launched into space
  7. 13. Which planet has the most explosive moon in the solar system
Down
  1. 2. A comet's tail points in which direction of sun
  2. 3. Heavenly Spheres"
  3. 4. What kind of galaxy is the Milky Way
  4. 6. Which is the closest galaxy to Earth outside the Milky Way
  5. 9. Which was the first space probe to leave the solar system
  6. 11. the tallest mountain in the solar system