Spacey Stuff:

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Across
  1. 2. A giant interstellar cloud of gas and dust.
  2. 9. Energy transmitted as waves or particles.
  3. 11. Space rock burning up in an atmosphere.
  4. 12. The layer of gases surrounding a planet.
  5. 17. A small, rocky object orbiting the Sun.
  6. 18. A recognisable pattern of stars.
  7. 19. A luminous ball of gas powered by fusion.
  8. 20. The curved path of an object around a celestial body.
  9. 22. A colourless gas found on some planets/moons.
  10. 24. Shaped like a flattened circle or oval.
  11. 25. A regular or repeating arrangement.
  12. 26. A group of related parts working together.
Down
  1. 1. The lightest element and primary fuel for stars.
  2. 3. The distance light travels in one year.
  3. 4. The scientific study of space and stars.
  4. 5. All of space, time, matter, and energy.
  5. 6. The imaginary line an object rotates around.
  6. 7. The force of attraction between two masses.
  7. 8. diagram: A drawing with sizes proportionally reduced or enlarged.
  8. 10. An unmanned spacecraft used for research.
  9. 13. A large, round object that orbits a star.
  10. 14. An icy body that develops a tail near the Sun.
  11. 15. dust: Tiny particles of matter in space.
  12. 16. A massive system of stars, gas, and dust.
  13. 19. A natural or artificial object orbiting a planet.
  14. 21. A reusable spacecraft for transport.
  15. 23. One celestial body blocking light from another.