Across
- 3. big pile of rocks
- 5. big star collapses
- 7. the origin of the universe
- 8. force created by objects that attracts
- 10. everything that we know
Down
- 1. matter released by star when it collapses
- 2. a small planet orbiting a bigger planet
- 3. a spherical pile of rocks
- 4. cloud of gas
- 5. a big ball of gas burning
- 6. movement around a gravitational force
- 9. gray matter that forms the core of Earth