Week 4 Science Crossword

123456789
Across
  1. 2. the distance that light can travel in one year
  2. 4. the process that combines atoms and releases energy
  3. 9. a group of stars
Down
  1. 1. mostly known as the Big Dipper
  2. 3. scientist who study space
  3. 5. a set of connected parts
  4. 6. invisible energy
  5. 7. a large group of stars
  6. 8. the North Star