Astronomy & Space Science

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Across
  1. 3. The day night and day finally agree to split evenly
  2. 4. The path a body takes around something bigger
  3. 5. What gives a planet its day
  4. 7. A planet's invisible force field
  5. 8. How bright a star truly is, not just how it looks
  6. 9. The invisible leash keeping planets in line
  7. 10. A connect-the-dots picture written in stars
  8. 16. The thin blanket keeping a planet breathable — or not
  9. 17. Why a star seems to shift when you move
  10. 19. A shooting star that actually landed
  11. 20. A theoretical shortcut through spacetime
Down
  1. 1. A star's explosive final act
  2. 2. A world orbiting a star that isn't ours
  3. 6. Light stretching as something races away
  4. 11. When one celestial body photobombs another
  5. 12. The path something takes once it's launched
  6. 13. A cosmic nursery of gas and dust
  7. 14. Something that circles a bigger body, natural or man-made
  8. 15. Brings the impossibly far uncomfortably close
  9. 18. A rocky wanderer too small to be a planet