[ceejayoz]

Scientists, rightly so, are a little leery of stating "we know everything". There's no guarantees our current theories are perfect - in fact, it's extraordinarily unlikely that they are.

Also of note: https://en.wikipedia.org/wiki/Alcubierre_drive

[jp555]

I consider how we understand that at the speed of light, all distances are zero. So even if you can somehow travel at C, there would be nowhere to go, because you're already everywhere. Given this, travelling faster than C can be seen as travelling a distance of less than zero... which makes no sense.

[ceejayoz]

Humans have always had a big gap between "how we understand" and knowing everything. Plenty of stuff in physics doesn't make intuitive sense, and there are things like https://en.wikipedia.org/wiki/Alcubierre_drive theorized that wouldn't require brute force exceeding C.

[jp555]

That drive has a bit of an issue that even if it worked, it would probably destroy it's destination in a annihilating blast of gamma radiation on arrival.