Universe

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Across
  1. 2. A natural satellite that orbits a planet.
  2. 3. The curved path an object takes around a star or planet.
  3. 6. The imaginary line a planet rotates around.
  4. 9. An icy body that grows a tail when nearing the Sun.
  5. 10. One complete trip around the Sun (a "year").
  6. 11. The distance light travels in one year.
  7. 14. The force that pulls objects toward each other in space.
  8. 15. The explosive death of a massive star.
  9. 17. The measure of a star's brightness.
  10. 20. The actual brightness of a star compared to the Sun.
  11. 23. All of space, time, matter, and energy that exists.
  12. 25. When one space body moves into the shadow of another.
Down
  1. 1. A massive ball of gas undergoing nuclear fusion.
  2. 2. A streak of light caused by a space rock burning in air.
  3. 4. Any object, natural or man-made, that orbits another.
  4. 5. One complete spin of a planet on its axis (a "day").
  5. 7. Related to the Sun (from the Latin word Solis).
  6. 8. Clue
  7. 12. A space entirely devoid of matter, like most of outer space.
  8. 13. Hole A region of space with gravity so strong even light cannot escape.
  9. 16. A large body that orbits a star and has cleared its path.
  10. 18. A massive system of stars, gas, and dust held by gravity.
  11. 19. A rocky object orbiting the Sun, mostly between Mars and Jupiter.
  12. 21. An instrument used to see distant objects in space.
  13. 22. Bang The theory explaining the origin and expansion of the universe.
  14. 24. A giant cloud of dust and gas where new stars are born.