6th Grade Space Challenge

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Across
  1. 3. Force that increases with mass and decreases with distance
  2. 4. Remnant that survives atmospheric entry and impacts a surface
  3. 6. Planet with extreme axial tilt causing it to roll along its orbit
  4. 8. Airless planet with extreme temperature variation
  5. 10. Point in orbit when axial tilt is maximally toward or away from the Sun
  6. 13. Only known planet with stable liquid water and diverse life
  7. 15. Partial shadow where only some light is obstructed
  8. 17. Factor that influences solar energy received due to Earth’s curvature
  9. 19. Alignment event where one body moves into another’s shadow
  10. 20. Object that rotates and revolves in the same 27.3-day period
  11. 21. Low-density planet with extensive ring structures
  12. 22. Process combining atomic nuclei to release vast energy
  13. 23. Changing illuminated portion caused by orbital position
  14. 26. Volcanic plains formed by ancient lava flows on the Moon
  15. 28. Dwarf planet with a 248-year orbital period
  16. 29. Visible streak produced by atmospheric friction heating a meteoroid
  17. 30. Earth’s yearly journey that takes approximately 365.24 days
  18. 32. Body that dominates its orbital zone and reflects sunlight
Down
  1. 1. Surface features preserved due to lack of atmosphere and erosion
  2. 2. Nearly circular path maintained by gravitational attraction
  3. 5. Planet with Valles Marineris and Olympus Mons
  4. 6. Region of total shadow where light is completely blocked
  5. 7. Distant planet with methane-rich atmosphere and strong winds
  6. 9. Motion responsible for the daily cycle of daylight and darkness
  7. 11. Star whose core undergoes fusion at about 15 million degrees Celsius
  8. 12. Object forming a glowing coma and tail when near the Sun
  9. 13. Moment when both hemispheres receive nearly equal sunlight
  10. 14. Instrument that enabled discovery of additional planets after 1600s
  11. 16. Region where sunlight strikes most directly year-round
  12. 18. Imaginary line tilted in a constant direction through Earth’s center
  13. 24. Irregular rocky remnant concentrated between Mars and Jupiter
  14. 25. Gas giant with a rapid rotation and a persistent storm system
  15. 27. Result of axial tilt combined with orbital motion
  16. 31. Planet with a dense carbon dioxide atmosphere and runaway greenhouse effect
  17. 33. Term describing phenomena involving Earth’s natural satellite