Level 1 - General Space

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Across
  1. 5. Relating to the Sun.
  2. 8. Earth's twin in size and proximity.
  3. 9. Planet known for its rings.
  4. 11. Distance light travels in one year.
  5. 12. Icy body with a glowing tail.
  6. 13. The Red Planet.
  7. 15. All existing matter and space as a whole.
  8. 20. Artificial object orbiting a planet.
  9. 21. Path of a celestial object around another.
  10. 23. Planet outside our solar system.
  11. 27. Galaxy containing our solar system.
  12. 28. The universe as an ordered whole.
  13. 29. Once a planet, now a dwarf planet.
Down
  1. 1. Force that attracts objects toward one another.
  2. 2. Space traveler.
  3. 3. Theory about the universe's origin.
  4. 4. Largest planet in the Solar System.
  5. 6. Region of space with immense gravity.
  6. 7. Private space exploration company.
  7. 10. U.S. space exploration agency.
  8. 14. Natural light display in polar regions.
  9. 16. Protective clothing for astronauts.
  10. 17. Vehicle used for space travel.
  11. 18. A rocky body orbiting the Sun.
  12. 19. A massive system of stars and planets.
  13. 22. Cloud of gas and dust in space.
  14. 24. Relating to the Moon.
  15. 25. Instrument to view distant celestial objects.
  16. 26. A shooting star.
  17. 27. Earth's natural satellite.