Across
- 4. the fourth dimension
- 7. deals with general Structure
- 10. how hot or cold something is
- 12. a type of particle
- 13. own by antiparticle
- 14. metallic element
- 15. when gravitational effect starts
Down
- 1. amount per unit
- 2. expansion of the universe reverse
- 3. a type of material to use in space
- 5. arrival or coming
- 6. how light travels
- 8. tiny energy sources
- 9. Blue pigment
- 11. when universe expands