Across
- 3. all of the existing matter and energy in space
- 5. a group of stars
- 7. oval-shaped path an object follows
- 8. an imaginary line through the center
Down
- 1. phase change in the moon’s appearance from Earth
- 2. a collection of solar systems
- 4. the moon’s shadow blocks sun’s light
- 6. System a system of objects in space