Three astronauts describe their experience seeing Earth from space. They note how small and fragile the planet looks, and how national boundaries disappear when viewed from above. Later astronauts express realizing our shared humanity and interdependence from the perspective of space. One says they understood "we are all sailing in the same boat." Overall, the document conveys astronauts finding a greater sense of unity and shared stake in Earth's preservation when viewing it from the distance and perspective of space.