Across
- 5. Effects of Gravity
- 8. Rate of speeding up
- 11. Discover about a topic
- 12. Unseen elements
Down
- 1. Matter we don't understand
- 2. Alert to something
- 3. What the Universe does
- 4. Matter we know
- 6. Energy we don't understand
- 7. Holds everything together
- 9. Combination of Solar Systems
- 10. Everything in existence