Expanse of the Universe Crossword

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Across
  1. 2. main force that holds stars together to form galaxies
  2. 4. planet with the largest orbital radius
  3. 5. this measures how far a planet is from the Sun
  4. 6. a system of stars and other matter held together by gravity
  5. 8. made up of galaxies, stars, and planets
  6. 10. dwarf planet smaller than the moon
  7. 11. this planet is the hottest because it has an atmosphere that traps heat
  8. 12. this planet has one side that always faces the Sun, which makes it much colder on one side
Down
  1. 1. only planet with one natural satellite
  2. 3. another name for the rocky planets
  3. 7. largest planet
  4. 9. gas giant with the most moons