Cosmology is not a science

“‘Cosmology may look like a science, but it isn’t a science,’ says James Gunn of Princeton University, co-founder of the Sloan survey. ‘A basic tenet of science is that you can do repeatable experiments, and you can’t do that in cosmology.’”

Cho, Adrian, A singular conundrum: How odd is our universe? Science 317(5846):1848–1850, 2007.