With the launch of Artemis II mission, I've been listening to
discussions on radio. Scientists are careful to refer to the non-Earth
facing side of the moon as the 'far side', as they should. The 'dark
side' is something popularised (I suspect) by Pink Floyd.
I was therefore surprised to see this current ngram:
[Note: The last cross-over of the two phrases was in the mid-70s . It's after the album was released (1973). The previous cross-over was 1955,
the start of space flight and Sputnik.]
WARNING: Generalisation ahead
Music still has a bigger sway on the irrational public than science does.