Stars and the Universe

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Across
  1. 4. Take me to your leader.
  2. 6. Not visible to the unaided eye.
  3. 9. This planet has the most craters out of any in the solar system.
  4. 10. This celestial body possesses 99.9% of the solar system's mass.
  5. 12. One day here is longer than one Earth year.
  6. 13. Predicted this celestial body's appearance saved Christopher Columbus' life.
  7. 15. The closest planet to our solar system.
  8. 18. Albert Einstein rejected the idea that these existed.
Down
  1. 1. Toilet Humor
  2. 2. The most distant from Earth human spacecraft ever made.
  3. 3. Cronus
  4. 5. Comprises 85% of all mass in the universe.
  5. 7. Supposedly makes up 72% of the universe's energy.
  6. 8. Disk-shaped "leftovers" from the solar system's creation.
  7. 11. A day here is only 10 hours.
  8. 14. The most unique planet.
  9. 16. Has a heart shaped glacier the size of Texas and Oklahoma.
  10. 17. There are more of these on Earth than stars in the Milky Way.