“There is perhaps no better a demonstration of the folly of human conceits than this distant image of our tiny world,” American astronomer Carl Sagan wrote the first time he saw Pale Blue Dot, a photograph taken of Earth from a record six billion kilometres away, in 1990. Nowadays, of course, such images are in great supply, providing momentary doses of realism and perspective via Instagram whenever needed. Here we select three of our favourite accounts for space-themed…
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