Uranus: The Sideways Planet

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Across
  1. 2. An unmanned exploratory spacecraft.
  2. 4. Something that deviates from the standard or expected.
  3. 7. Relating to or forming an axis.
  4. 8. A person or thing of very great strength, intellect, or importance (used for planets).
  5. 10. Study of the interaction between matter and electromagnetic radiation.
  6. 13. Lacking the ability or strength to move; chemically inactive.
  7. 14. Occurring by a fortunate accident.
  8. 17. Existing at or from the beginning of time.
  9. 19. Relating to a large-scale and violent event in nature.
  10. 20. A widely accepted way of doing something.
Down
  1. 1. A greenish-blue color.
  2. 3. The angle of an object's axial tilt.
  3. 5. Region of space dominated by a planet's magnetic field.
  4. 6. The layer of a planet between the crust/atmosphere and core.
  5. 9. The path of a celestial body around another.
  6. 11. Positioned in or relating to the sky, or outer space.
  7. 12. Mysterious and difficult to understand.
  8. 15. Calm, peaceful, and untroubled.
  9. 16. Intensely cold.
  10. 18. Very weak, slight, or insubstantial.