How NASA taught four astronauts to read the moon

How do you teach someone to look at the moon? Not glance at it, the way we all have on a clear night, but truly read it, the way a geologist reads a hillside. That was the challenge NASA set itself before Artemis II, because when Reid Wiseman, Victor Glover, Christina Koch and Jeremy Hansen swung around the far side of the moon this April, the first humans to make the journey in more than 50 years, their most valuable scientific instrument was not a camera or a sensor. It was the trained human eye.