According to our current understanding of physics, traveling faster than the speed of light is not possible for objects with mass. The theory of relativity, proposed by Albert Einstein, establishes a fundamental limit on the speed of light in a vacuum as the maximum attainable speed.
One consequence of traveling faster than light would be a violation of causality, which is the principle that cause and effect must occur in a specific order. If an object could travel faster than light, it could potentially reach a destination before a cause that it relies on to reach that destination has occurred. This scenario would lead to paradoxes and contradictions, such as effect preceding cause or the ability to change the past, which violate our understanding of the laws of physics as we currently know them.
The concept of traveling faster than light leading to time travel and going "back in time" is often explored in science fiction, but it remains purely speculative and not supported by scientific evidence or theories at this time.
It's important to note that there are hypothetical theories and ideas, such as wormholes or certain solutions in general relativity, that suggest the possibility of shortcuts in spacetime that could allow for faster-than-light travel or potential time travel. However, these concepts are highly speculative and purely theoretical, with no experimental confirmation or practical implementation currently possible.
In summary, according to our current scientific understanding, traveling faster than light is not feasible for objects with mass, and it does not lead to backward time travel based on our current knowledge of physics.