Across
- 2. a collection of billions of stars
- 4. the force of attraction
- 5. our closest star
- 7. the layers of gases that surround many planets and other bodies
- 9. pieces of rock or metal that orbit the sun
- 11. known as snowballs of the solar system
Down
- 1. a measurement of time
- 3. a person who travels and works in space
- 6. are satellites of planets
- 7. a spectacular light show
- 8. a round ball shape is called a sphere
- 10. the name given to a collision between two objects in space