Universe Unit Crossword

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Across
  1. 2. Hole, a collapsed star with gravity so strong that not even light can escape
  2. 5. the force that pulls objects toward one another
  3. 6. a large group of stars, gas, and dust held together by gravity
  4. 8. the study of objects and phenomena in space
  5. 15. a galaxy that has no clear shape
  6. 17. Bang, the theory that the universe began with a massive expansion
  7. 18. the process of the universe growing larger over time
  8. 19. a tool that helps scientists observe distant stars and galaxies
  9. 20. an explosion that happens when a massive star dies
Down
  1. 1. a galaxy that is shaped like a circle or oval
  2. 3. a giant ball of hot gas that gives off light and heat
  3. 4. Way, the galaxy that contains our solar system
  4. 7. Sequence, the stage in a star’s life when it shines steadily like our Sun
  5. 9. Giant, a large, cool star formed when a medium star runs out of fuel
  6. 10. a huge cloud of gas and dust where stars are born
  7. 11. the distance light travels in one year
  8. 12. Dwarf, the small, dim core left after a red giant loses its outer layers
  9. 13. a galaxy shaped like a pinwheel, such as the Milky Way
  10. 14. the main element that fuels stars
  11. 16. everything that exists including all matter, energy, and space