Take author's moon landing example. If you really care, there are mirrors on the moon. If you want to know we've been there or not, you can devise an experiment, fire a laser at those mirrors, and get a reflected beam back.
People now call things like "climate change" a science (and it's settled!), without doing the fundamental thing science requires: An experiment with a control group. Climate models are statistical correlation, not an experiment with a control group. It is not proof of causality.