A new theory isn't going to contradict your observations. It may provide an alternate explanation and allow you to understand the phenomenon a different way, bu

A new theory isn't going to contradict your observations. It may provide an alternate explanation and allow you to understand the phenomenon a different way, but the phenomenon leading to the observation is unchanged. This is important in this discussion because we've never observed anything traveling faster than the speed of light in a vacuum. That would appear to rule-out faster-than-light travel, which for practical reasons would make traveling to other solar systems impossible.