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Regarding time and space, it is difficult not to remember Einstein and his theory of relativity...

I wonder if it will be possible for us to master the speed of light. One day I know it will be possible, but I have no idea when.

A lot of difference between physics saying something is possible and having the engineering creating something that actually can do what the physicists say is possible.

It is like quantum computing. The mechanics have been known for decades. Building a computer based upon that, a much different story.

Yes, it's true, sometimes theory doesn't apply in the same way in practice. Regardless of both fields, humanity must continue to evolve.