| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | gravity | Mars mission scientists | Studied and accounted for in all calculations and equipment designs | 1 |
| 2 | gravity | NASA | Natural force that keeps objects on the ground on Earth | 1 |
| 3 | gravity | NASA | A force that needs to be overcome for successful space missions | 1 |
| 4 | gravity | NASA scientists | A key force governing planetary motion and space travel | 1 |
| 5 | zero gravity | NASA engineers | Experienced by astronauts in space due to microgravity conditions | 1 |