I spent some time with Gene Cernan, the Apollo 17 astronaut who was the last guy to walk on the Moon. He told me two things that I couldn’t stop telling people:
1. the Earth is round in space like a ball, not flat looking like the Moon is to us. He said while looking up from the lunar surface, the Earth just hung there, like a grapefruit that he could almost grab if he just jumped high enough. Could see the weather change too.
2. because of the smaller size of the Moon, not only is it’s curve very visible, the apparent horizon is also much closer so he said there were moments where if he ran too fast or jumped too high he felt like he was going to fall off.