Across
- 4. most galaxies are _: some explosion caused movement
- 6. closest to the sun
- 7. gravity pulls this together
- 9. energy released when electrons attach to protons
- 10. plasma makes up this planet
Down
- 1. we are made from this
- 2. most abundant elements
- 3. largest planet in our solar system
- 5. nebula is dust gas and __ held together by gravity
- 6. farthest from the sun
- 8. when clumps of mass compress nuclear fusion