“Everything we need, Earth provides. And that is somewhat of a miracle, and one that you can’t truly know until you’ve had the perspective of the other.” This is how the US astronaut Christina Koch summed up her experience of travelling to the far side of the moon on Monday. The feeling of a deepened appreciation for home recalls statements by an earlier generation of space travellers. The famous Earthrise photograph, taken on the Apollo 8 mission in 1968, has been credited as one of the drivers behind the environmental movement. Such was the power of the first images of the “blue planet” captured from space.

The hope that such journeys can foster global cooperation and appreciation for life was also the theme of the prize-winning novel Orbital, which is set on a space station among a multinational crew. But if it was........

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