Across
- 6. collection of eight planets and their moons in orbit around the sun
- 7. a system of millions and billions of stars
- 8. combining two hydrogen's is hellium
- 10. light of stars moving away from us, shift red
Down
- 1. the farter the faster they move
- 2. most galaxies moving away from us and eachother
- 3. a fixed luminous point in the
- 4. Echos of explosion are long wave
- 5. basic unit of a chemical element
- 9. sky which is large