If you were in a sealed box moving near the speed of light, could you tell?
Perhaps an obvious question, since I believe relativity states that you couldn't know your own velocity, but im not sure if there's a more interesting answer.
If you were placed in a sealed box moving at close to the speed of light through empty space, is there any kind of experiment you could run that would tell you anything about your velocity? Perhaps you could notice the wavelength of light shifting in your box.