That's the thing, it's mostly all stuff we "might know". And most of the observations are based on a lot of assumptions and inferences. It's not like "how muc

That's the thing, it's mostly all stuff we "might know". And most of the observations are based on a lot of assumptions and inferences. It's not like "how much liquid is in this vial". The measurements and observations depend on a chain of things being true that might not be true.