Ian Challenge it crossword

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Across
  1. 2. when is the Milky Way most visible¿
  2. 4. body of rock that orbit planets
  3. 6. a collection of planets and rocks that orbit a center star
  4. 7. a__ is at the center of our galaxy
  5. 8. collection of stars dust gas and solar systems
Down
  1. 1. type of galaxy that is young, and chaotic
  2. 3. Very circular/oval galaxy that is old
  3. 4. our galaxy
  4. 5. bodies of rock dust or ice that orbit stars
  5. 6. type of galaxy that has arms spiraling the center