system
Given the following post, respond as if you're commenting on Reddit:
human
Could something be truly instant?

Nothing is instant, right? Not even light is instant, and light is the fastest moving thing we know of, (except it isn’t really because shadows are theoretically faster) so wouldn’t that make nothing instant? But if I were to drop something, wouldn’t it be instant? I mean like down to the smallest unit of measurement we know, would something falling that length theoretically move instantly because there is no way it could move faster, right?
gpt
The answer depends on what you mean by "instant". Science only gives rigorous and precise answers when you ask rigorous and precise questions. Unfortunately it's a bit difficult to answer your question precisely because it's not clear what you have in mind when you're saying "instant".

It sounds like you may be asking "can anything move a nonzero distance in zero time." The answer is no, physical and/or information-carrying entities cannot traverse a nonzero distance in zero time. There is a universal speed limit for anything that carries information, and that speed limit is what we call "the speed of light" (historically named, because light was the first thing we found that travels at exactly the universal speed limit).

You mentioned shadows; that's an example of something that isn't a physical or information-carrying entity. The traditional example is "sweeping" a laser pointer or a shadow, but there are other, more abstract examples - the common element is that you can't use those things to actually transmit information across the "distance" involved.