Something profound happens when astronauts see Earth from space for the first time

When astronauts first saw Earth from afar in the Apollo 8 mission in 1968 — the US's second manned mission to the moon — they described a cognitive shift in awareness after seeing our planet "hanging in the void." This state of mental clarity, called the "overview effect," occurs when you are flung so far away from Earth that you become totally overwhelmed and awed by the fragility and unity of life on our blue globe. It's the uncanny sense of understanding the "big picture," and of feeling connected yet bigger than the intricate processes bubbling on Earth.

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