SPACE

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Across
  1. 2. Relating to the Moon. (l)
  2. 9. A streak of light seen when space rock burns in Earth’s atmosphere. (m)
  3. 10. The spinning of a planet on its axis. (r)
  4. 11. A region of space with almost no air or matter. (v)
  5. 14. The distance light travels in one year. (l)
  6. 16. A rocky object that travels through space. (a)
  7. 18. Relating to the Sun. (s)
  8. 19. The amount of matter in an object. (m)
  9. 23. A person trained to travel in space. (a)
  10. 25. A superheated state of matter found in stars. (p)
  11. 26. A massive system of stars, gas, and dust held together by gravity. (g)
  12. 27. The part of a spacecraft that carries astronauts. (c)
  13. 28. The line where Earth’s surface appears to meet the sky. (h)
  14. 29. An imaginary line through the center of a planet that it spins around. (a)
  15. 30. The force that pulls objects toward one another. (g)
  16. 34. A large cloud of gas and dust in space where stars can form. (n)
  17. 35. An unmanned spacecraft sent to explore space. (p)
  18. 36. A natural satellite that orbits a planet. (m)
  19. 37. All of space and everything in it. (u)
  20. 38. An icy object that forms a glowing tail when near the Sun. (c)
Down
  1. 1. An object that orbits a planet. (s)
  2. 3. A vehicle designed to travel into space. (r)
  3. 4. A robotic vehicle designed to move across the surface of another planet. (r)
  4. 5. A bowl-shaped hole formed by an impact. (c)
  5. 6. A term used to describe a small star or small planet like Pluto. (d)
  6. 7. A pattern of stars that forms a recognizable shape. (c)
  7. 8. An event when one object in space blocks the light of another. (e)
  8. 12. The galaxy that contains our solar system. (m)
  9. 13. The measure of how strongly gravity pulls on an object. (w)
  10. 15. The force responsible for keeping planets in orbit. (g)
  11. 17. Another word for the universe. (c)
  12. 20. A massive ball of hot gas that produces light and energy. (s)
  13. 21. The process that powers the Sun by joining atoms together. (f)
  14. 22. The range of different wavelengths of light. (s)
  15. 24. The curved path a planet follows as it travels around a star. (o)
  16. 29. The layer of gases surrounding a planet. (a)
  17. 31. The movement of a planet around the Sun. (r)
  18. 32. The act of sending a spacecraft into space. (l)
  19. 33. An instrument used to observe distant objects in space. (t)
  20. 35. A large object that orbits a star and does not produce its own light. (p)