Across
- 3. range of electromagnetic radiation
- 5. chemical element of atomic number 1.
- 6. all existing matter and space as a whole
- 8. rapid expansion of matter
- 9. the chemical element of atomic number 3
Down
- 1. stable subatomic particle, negative charge
- 2. stable subatomic particle, positive charge
- 4. the force that attracts inward
- 5. the chemical element of atomic number 2,
- 7. a system of millions or billions of stars