Across
- 2. smallest planet
- 4. our galaxy
- 5. explosion of a star
- 6. shining gas held in a ball
- 7. dust or gas cloud found between stars
- 8. meteor
Down
- 1. biggest planet
- 3. large group of stars held together by gravity
- 5. particles and energy that burst from the sun
- 8. star in the middle of our solar system