Across
- 2. the gradual accumulation of matter
- 4. A giant cloud of gas and dust
- 5. the collection of planets and other celestial objects
- 6. anything that orbits a planet
- 8. makes a nebula collapse
Down
- 1. explanation for the formation of stars and planets
- 3. small chunks of rock and ice
- 7. formed from gas and dust collapsing