Across
- 3. a part of an atom with neutral charge
- 5. a celestial body that orbits a sun
- 6. rain, when gas emissions combine with water
- 8. zero, lowest temperature possible
- 9. tectonics, the movement of the earth's crust
- 11. fission, when two atoms fuse together
- 12. the patha celestial body follows
- 14. lets gas and liquid through it
Down
- 1. living object that can function on its own
- 2. a celestial body made of rock
- 4. rock, a rock formed by clay
- 7. hole, the result after a star collapses
- 8. erosion by friction
- 10. someone who studies planets and space
- 13. a cloud of dust in space