A Hedge Fund Manager Who’s Shorting America’s Malls (2017)
https://news.ycombinator.com/item?id=14209161 10.8 Mechanics under the clouds
"We are fortunate that the principles of Newtonian mechanics could be developed and verified to great accuracy by studying astronomical phenomena, where friction and turbulence do not complicate what we see. But suppose the Earth were, like Venus, enclosed perpetually in thick clouds. The very existence of an external universe would be unknown for a longtime, and to develop the laws of mechanics we would be dependent on the observations we could make locally.