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Across
  1. 4. – Rocky object orbiting the Sun, smaller than a planet
  2. 9. – Tool used to observe distant objects in space
  3. 11. – Rate of change of velocity
  4. 14. – Object that orbits a planet, natural or artificial
  5. 16. – All of space, time, matter, and energy
  6. 17. – The path one object takes around another
  7. 18. – Einstein’s theory describing space, time, and gravity
  8. 19. – A large body orbiting a star
Down
  1. 1. – A massive system of stars, dust, and gas
  2. 2. – Cloud of gas and dust where stars form
  3. 3. – Icy object with a glowing tail when near the Sun
  4. 5. – The Red Planet
  5. 6. – One complete orbit around another object
  6. 7. – Longest or shortest day of the year
  7. 8. – A streak of light from a rock burning in Earth’s atmosphere
  8. 10. – One celestial body blocking another
  9. 12. – Day when sunlight is evenly distributed across Earth
  10. 13. – A spinning motion around an axis
  11. 15. – Force that attracts objects with mass
  12. 20. – A person trained to travel into space