Across
- 2. Engine used for adjusting spacecraft movement
- 5. System of connected tubes or pathways
- 7. Concept combining space and time into one fabric
Down
- 1. Process where atoms combine to release energy
- 3. Bubble-like region around the sun created by solar wind
- 4. Force pulling objects toward each other
- 6. Empty space with no air or matter
- 7. Open region of visible sky or space