The Solar System

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Across
  1. 4. The shape of orbits in Kepler's model (10)
  2. 6. When a planet lies on a line between Earth and the Sun (11)
  3. 12. Formulated laws of gravitational motion (6)
  4. 17. A telescope with mirrors (9)
  5. 18. A space probe that crashes into a body (8)
  6. 19. Egyptian who refined geocentric model (7)
  7. 21. Big fan of Mars (5)
  8. 23. A day particularly short or long (8)
  9. 24. The shape of orbits in early models (8)
Down
  1. 1. Earth at the centre (10)
  2. 2. A small circle whose circumference moves around a larger one (8)
  3. 3. A space probe that lands on a body (6)
  4. 5. View an inferior planet when this is greatest (10)
  5. 7. Sun at the centre (10)
  6. 8. A telescope with lenses (9)
  7. 9. Published heliocentric thesis on deathbed (10)
  8. 10. The 'wobbling' of Earth's axis (10)
  9. 11. Motion that appears backwards (10)
  10. 13. A day and night of equal length (7)
  11. 14. What Aristotle believed made the planets orbit (5,5)
  12. 15. Greek philosopher who proposed geocentric model(11)
  13. 16. When a planet is closest to Earth (10)
  14. 20. A space probe that orbits a body (7)
  15. 22. A space probe that passes a body (5)