Across
- 5. the first subatomic particle to show up
- 7. has all elements listed on it
- 9. galaxies look like this when they are far away
Down
- 1. used to study light
- 2. we live in it
- 3. element that makes up 73% of the universe
- 4. proton, electron etc
- 6. huge event
- 8. gas that fills up the universe