1968. Apollo 8. This was the 1st time we were able to see our beautiful blue planet while orbiting our moon.

This is from the epilogue of Neil Shubin's "Your Inner Fish":

"Apollo 8 was a product of the essential optimism that fuels the best science. It exemplifies how the unknown should not be a source of suspicion, fear, or retreat to superstition, but motivation to continue asking questions and seeking answers."