| 1 | The air rarefies at the top of the mountain. | |
| 2 | This means thin air and weak winds. | |
| 3 | Mars is a six-month flight away, and it has surface gravity, a thin atmosphere, frozen water, carbon dioxide and essential minerals. | |
| 4 | Now Touching the Void outsells Into Thin Air more than two to one. | |
| 5 | They stepped on the first step and vanished into thin air. |