Across
- 4. All of space, time, matter, and energy together
- 5. A very light element formed soon after the BigBang
- 6. When small particles join together to make something bigger
- 8. The massive explosion that happens when a star dies
Down
- 1. The simplest and most common element in the universe
- 2. Substances made of only one kind of atom
- 3. The giant event that started everything in space
- 7. A huge ball of glowing gas where elements are created