it requires logical deductions about the properties of space, which are common sense. for example, it takes longer to cross more space. it takes less time to cross less space. we also use the common fact that everything moves from high concentrations to low: look at balloons, and heaters.
if you look up, you see celestial objects rotating. that is evidence for a whirlpool, in flat or dual earth theory. round earth theory has been disproven multiple times. ignorance is not an excuse, you are on a flat earth forum, look around.
"Even if abiogenesis couldn't be observed, it could be inferred by evidence... "
well done. you used your brain. try to make another connection. deduction is a valid way of reaching conclusions. the movement of space is observed daily, the simple fact is you reject any evidence whatsoever because you reject the model on principle. that is simply bad science.