Were we not talking about how visible the curvature of the Earth is in pictures taken at high altitudes?
Light diffracts and shines on other things and generally is visible to people not in its direct path, we're not talking about a laser in a vacuum here. And you're conveniently ignoring my point about the heights of observer and observed.
Technically true, since a fact and a theory are different things, but "density causes things to fall" is a theory, and it's a much worse theory than gravity because, before any other issues with it, density isn't even a force.
I'm looking at obviously wrong things and giving off-the-top-of-my-head reasons why the obviously wrong things are wrong - you think this is effort for me?
RE: Question : At what height do we see curvature