Across
- 4. clumps of materials that form from smaller grains in the nebula
- 5. molecules form droplets and solid grains as they cool
- 7. a cloud of gas and dust in space
Down
- 1. ices and _______-rich materials are abundant in the low temperatures of the outer solar system
- 2. exoplanets that orbit very close to stars reveal this aspect of solar system formation
- 3. building of larger masses by smaller masses sticking together
- 6. most of the mass of the original solar nebula